NSTA RSS Feeds 

Search Results

Nature of Light: Light and Color Science Object
Science Object
Nature of Light: Light and Color
Grade Level: Elementary School, Middle School
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the third of four Science Objects in the Nature of Light SciPack. It provides conceptual and real world understanding of how the wavelengths of electromagnetic radiation affect the way they interact with different materials. We perceive differences of wavelength within the visible...  [view full summary]
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the third of four Science Objects in the Nature of Light SciPack. It provides conceptual and real world understanding of how the wavelengths of electromagnetic radiation affect the way they interact with different materials. We perceive differences of wavelength within the visible part of the spectrum as differences in color. Shorter wavelengths of light (blue) are scattered more by air molecules than longer wavelengths of light (red). When the atmosphere scatters sunlight—which is a mixture of all wavelengths—short-wavelength light (which gives us the sensation of blue) is scattered much more by air molecules than long-wavelength (red) light is. The atmosphere, therefore, appears blue and the sun seen through it by un-scattered light appears reddened. Also, materials that allow one range of wavelengths to pass through them may completely absorb others. For example, some gases in the atmosphere, including carbon dioxide and water vapor, are transparent to much of the incoming sunlight but absorb the infrared radiation from the warmed surface of Earth.
[hide full abstract]
Member Price: Free      Nonmember Price: Free
Nature of Light: So, What is Light? Science Object
Science Object
Nature of Light: So, What is Light?
Grade Level: Elementary School, Middle School
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the final of four Science Objects in the Nature of Light SciPack. It provides an understanding of how sometimes the nature and behavior of electromagnetic radiation such as light can be best described using a wave model, but at other times it can be best described by using a particle...  [view full summary]
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the final of four Science Objects in the Nature of Light SciPack. It provides an understanding of how sometimes the nature and behavior of electromagnetic radiation such as light can be best described using a wave model, but at other times it can be best described by using a particle model. Particles of light called photons contain discrete amounts of energy. The energy that a photon carries is directly proportional to its frequency. The energy of a photon is inversely proportional to the wavelength of the electromagnetic radiation. Each kind of atom or molecule can only gain or lose energy only in discrete amounts so they can absorb and emit light only at frequencies and wavelengths corresponding to these amounts. These combinations of wavelengths or spectra can be used to identify the substance.
[hide full abstract]
Member Price: Free      Nonmember Price: Free
Nature of Light: Light as Waves Science Object
Science Object
Nature of Light: Light as Waves
Grade Level: Elementary School, Middle School
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the second of four Science Objects in the Nature of Light SciPack. It provides conceptual and real world understanding of the idea that waves (including sound and seismic waves, waves on water, and light waves) have energy and can transfer energy when they interact with matter....  [view full summary]
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the second of four Science Objects in the Nature of Light SciPack. It provides conceptual and real world understanding of the idea that waves (including sound and seismic waves, waves on water, and light waves) have energy and can transfer energy when they interact with matter. Wave behavior can be described in terms of how fast the disturbance propagates, and of the distance between successive crests or troughs of the wave (the wavelength). Accelerating electric charges produce electromagnetic waves which can be organized into a spectrum of varying wavelengths (and frequencies): radio waves, microwaves, radiant heat or infrared radiation, visible light, ultraviolet radiation, x-rays, and gamma rays. These wavelengths vary from radio waves (the longest) to gamma rays (the shortest). Human eyes only respond to a narrow range of wavelengths of electromagnetic radiation—what we call visible light. In empty space, electromagnetic waves of all wavelengths move at the same speed—the "speed of light."
[hide full abstract]
Member Price: Free      Nonmember Price: Free
Interdependence of Life: Agents of Change in Ecosystems Science Object
Science Object
Interdependence of Life: Agents of Change in Ecosystems
Grade Level: Elementary School, High School, Middle School
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the fourth of four Science Objects in the Interdependence of Life SciPack. It explores agents of change in ecosystems.

Various influences (including human impact, natural disasters, climate change, and the appearance of new species) can force an ecosystem into...  [view full summary]
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the fourth of four Science Objects in the Interdependence of Life SciPack. It explores agents of change in ecosystems.

Various influences (including human impact, natural disasters, climate change, and the appearance of new species) can force an ecosystem into a state of different equilibrium. Depending on both the severity of the disturbance and the diversity of populations, feedback mechanisms may be sufficient to restore a state of equilibrium similar to the original ecosystem. However, if the disruptive influences are so severe (in duration and/or degree) they can push an ecosystem beyond its capacity to maintain equilibrium, irreversibly altering the system. In this case, a new point of dynamic equilibrium is eventually established, thus defining a new ecosystem.

Learning Outcomes:
  • Describe how populations might reach a new state of equilibrium following significant changes to the conditions (abiotic and biotic factors) defining their ecosystem.
  • Sequence and provide the rationale for a series of ecological processes that could logically occur following a large-scale disruption.
  • Given a description of factors that influence and affect population sizes in an ecosystem, identify those factors that could most likely contribute to an ecosystem’s long-term inability to return to dynamic equilibrium.
  • Explain how human activity (mining, dam construction, housing development) could affect the equilibrium of an ecosystem.

[hide full abstract]
Member Price: Free      Nonmember Price: Free
Nature of Light: Characteristics of Light Science Object
Science Object
Nature of Light: Characteristics of Light
Grade Level: Elementary School, Middle School
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the first of four Science Objects in the Nature of Light SciPack. It establishes the concept that electromagnetic waves can interact with materials in different ways. For example, they can reflect off a material’s surface. We can see an object when light waves that are emitted or...  [view full summary]
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object is the first of four Science Objects in the Nature of Light SciPack. It establishes the concept that electromagnetic waves can interact with materials in different ways. For example, they can reflect off a material’s surface. We can see an object when light waves that are emitted or reflected by the object enter the eye. Electromagnetic waves can also pass through materials, sometimes slowing down or changing direction as a result of entering and leaving the material. Or, electromagnetic waves may be absorbed or scattered within the material. Electromagnetic waves and other waves diffract around corners, and interfere with one another in predictable ways.
[hide full abstract]
Member Price: Free      Nonmember Price: Free
Nutrition: What is Food? Science Object
Science Object
Nutrition: What is Food?
Grade Level: Elementary School, High School, Middle School
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object, co-developed between FDA and NSTA, is the first of four Science Objects in the Nutrition SciPack. It demonstrates that all living organisms require food for functioning, renewal, and growth. Animals use both plants and other animals as food. Food provides the necessary energy for bodily...  [view full summary]
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object, co-developed between FDA and NSTA, is the first of four Science Objects in the Nutrition SciPack. It demonstrates that all living organisms require food for functioning, renewal, and growth. Animals use both plants and other animals as food. Food provides the necessary energy for bodily movement and physiological processes. It also provides substances needed to repair and create bodily structures and regulate physiological processes such as cellular activity or immune responses. Nutrients, the substances and elements in food that the body requires, are classified according to their composition. For humans, these nutrients include carbohydrates, proteins, fats, vitamins, minerals, and water. Carbohydrates, fats, and protein are present in foods in larger amounts. Vitamins and minerals are present in only small amounts. Water, an essential nutrient, is part of every body cell and contributes to all physiological processes.
[hide full abstract]
Member Price: Free      Nonmember Price: Free
Ocean's Effect on Weather and Climate: Global Climate Patterns
 Science Object
Science Object
Ocean's Effect on Weather and Climate: Global Climate Patterns
Grade Level: Elementary School, Middle School
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object, co-developed between NOAA and NSTA, is the first of four Science Objects in the Ocean’s Effect on Weather and Climate SciPack. It explores global weather and climate patterns, focusing on why different conditions exist in specific areas. Earth’s weather patterns, which consist of different...  [view full summary]
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object, co-developed between NOAA and NSTA, is the first of four Science Objects in the Ocean’s Effect on Weather and Climate SciPack. It explores global weather and climate patterns, focusing on why different conditions exist in specific areas. Earth’s weather patterns, which consist of different conditions of temperature, precipitation, humidity, wind, air pressure, and other atmospheric phenomena, result in various climate zones across the globe. Weather and climate are the result of the transfer of energy from the Sun at and near the surface of Earth. Solar radiation heats land masses, oceans, and air differently, resulting in the constant transfer of energy as energy is “balanced” across the globe. Transfer of thermal energy at the boundaries between the atmosphere, land masses, and the oceans—influenced by dynamic processes such as cloud cover and relatively static conditions such as the position of mountain ranges and oceans—results in layers of different temperatures and densities in both the ocean and atmosphere. The action of gravitational force on regions of different densities causes them to rise or fall, forming convection currents (cells). This circulation, influenced by the rotation of the earth, produces winds and ocean currents.
[hide full abstract]
Member Price: Free      Nonmember Price: Free
Ocean's Effect on Weather and Climate: Global Precipitation and Energy
 Science Object
Science Object
Ocean's Effect on Weather and Climate: Global Precipitation and Energy
Grade Level: Elementary School, Middle School
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object, co-developed between NOAA and NSTA, is the second of four Science Objects in the Ocean’s Effect on Weather and Climate SciPack. It explores the distribution of water and energy on Earth. The cycling of water in and out of the atmosphere and oceans affects Earth’s climates by influencing...  [view full summary]
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object, co-developed between NOAA and NSTA, is the second of four Science Objects in the Ocean’s Effect on Weather and Climate SciPack. It explores the distribution of water and energy on Earth. The cycling of water in and out of the atmosphere and oceans affects Earth’s climates by influencing patterns of precipitation and by transferring energy between the oceans and the atmosphere. As water moves through the water cycle, it evaporates from Earth’s surface, rises and cools, condenses into rain, snow, or ice, and falls back to the surface. The water falling on land collects in rivers and lakes, soil, and porous layers of rock, and much of it eventually flows back into the ocean. The water cycle connects the oceans to all of Earth’s water reservoirs via evaporation and precipitation. The ocean loses thermal energy due to the evaporation of water. This energy transfer drives atmospheric circulation as water moves to the atmosphere as vapor and eventually condenses, releasing thermal energy to the surrounding air.
[hide full abstract]
Member Price: Free      Nonmember Price: Free
Nutrition: What Choices Lead to a Healthy Lifestyle? Science Object
Science Object
Nutrition: What Choices Lead to a Healthy Lifestyle?
Grade Level: Elementary School, High School, Middle School
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object, co-developed between FDA and NSTA, is the last of four Science Objects in the Nutrition SciPack. It demonstrates that variety, balance, and moderation in overall food choices are essential for human health, growth, and energy. The amounts of specific nutrients recommended for healthy...  [view full summary]
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object, co-developed between FDA and NSTA, is the last of four Science Objects in the Nutrition SciPack. It demonstrates that variety, balance, and moderation in overall food choices are essential for human health, growth, and energy. The amounts of specific nutrients recommended for healthy people depend on age, gender, heredity, and—for females—pregnancy and lactation. Energy recommendations—measured in calories—are set for age, gender, and physical activity level. Basal metabolic rate and body efficiency also impact energy needs. Food-guidance systems (e.g., MyPyramid) and nutrition information on food labels are founded in science-based evidence for nutrient and energy intake (e.g., Dietary Reference Intakes) and science-based dietary guidelines (e.g., Dietary Guidelines for Americans), and help people apply these recommendations to their daily food and lifestyle decisions. The food choices individuals make affect their nutritional status, and are influenced by personal, hereditary and social factors, as well as by individuals’ understanding of biological consequences.
[hide full abstract]
Member Price: Free      Nonmember Price: Free
Nutrition: What Happens to the Food I Eat? Science Object
Science Object
Nutrition: What Happens to the Food I Eat?
Grade Level: Elementary School, High School, Middle School
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object, co-developed between FDA and NSTA, is the second of four Science Objects in the Nutrition SciPack. It discusses how the body makes use of foods’ nutrients, after food is digested into simpler substances. These simpler substances must then be absorbed through the lining of the small...  [view full summary]
Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach. This Science Object, co-developed between FDA and NSTA, is the second of four Science Objects in the Nutrition SciPack. It discusses how the body makes use of foods’ nutrients, after food is digested into simpler substances. These simpler substances must then be absorbed through the lining of the small intestine and transported for use throughout the body for physiological processes. In cells, these nutrients and substances derived from them are taken in and react to provide the biochemical constituents needed to synthesize other molecules. Some cells store energy from the breakdown of some nutrients in specific chemicals that are used to carry out the many functions of the cell. The circulatory system moves substances to the cells and removes waste products. Lungs take in oxygen for metabolism and eliminate the carbon dioxide produced, excretory systems rid the body of dissolved and solid waste products, and the skin and lungs rid the body of excess heat energy.
[hide full abstract]
Member Price: Free      Nonmember Price: Free
Results: 1 - 10 of 2364 1 2 3 4 5 6 7 8 9 ... 237 Next