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Chapter 7 Section 4 Energy in Earths Atmosphere

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Anticipatory Set https://www.youtube.com/watch?v=xZ6XUk7QLbU https://www.youtube.com/watch?v=xZ6XUk7QLbUhttps://www.youtube.com/watch?v=xZ6XUk7QLbU

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Standards and Objectives S 6.3d: Students know heat energy is also transferred between objects by radiation. ( radiation can travel through space). S 6.3d: Students know heat energy is also transferred between objects by radiation. ( radiation can travel through space). S 6.4.b: Students know solar energy reaches earth through radiation, mostly in the form of visible light. S 6.4.b: Students know solar energy reaches earth through radiation, mostly in the form of visible light. Students will be able to: Students will be able to: State in what form energy travels from the Sun to the Earth State in what form energy travels from the Sun to the Earth Explain what happens to the suns energy in the atmosphere and at Earths surface. Explain what happens to the suns energy in the atmosphere and at Earths surface.

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Language of the Discipline electromagnetic waves electromagnetic waves radiation radiation infrared radiation infrared radiation ultraviolet radiation ultraviolet radiation scattering scattering greenhouse effect greenhouse effect

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Energy from the Sun (Input) Nearly all the energy in Earths atmosphere comes from the sun. Nearly all the energy in Earths atmosphere comes from the sun. This energy travels to Earth as electromagnetic waves- a form of energy that can move through the vacuum of space. This energy travels to Earth as electromagnetic waves- a form of energy that can move through the vacuum of space. Electromagnetic waves are classified according to wavelength, or distance between waves. Electromagnetic waves are classified according to wavelength, or distance between waves. Radiation- the direct transfer of energy by electromagnetic waves, so the electromagnetic waves given off by the sun are called solar radiation. Radiation- the direct transfer of energy by electromagnetic waves, so the electromagnetic waves given off by the sun are called solar radiation.

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Energy From the Sun ( cont.) Most of the energy from the sun travels to Earth in the form of visible light. Most of the energy from the sun travels to Earth in the form of visible light. Visible light includes all the colors you see in a rainbow. The different colors are the result of different wavelengths. Visible light includes all the colors you see in a rainbow. The different colors are the result of different wavelengths. Red and orange have the longest wavelengths, while blue and violet light have the shortest wavelengths. Red and orange have the longest wavelengths, while blue and violet light have the shortest wavelengths.

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Energy From the Sun ( cont.) Infrared radiation - a form of electromagnetic energy that has wavelengths that are longer than red light. Infrared radiation - a form of electromagnetic energy that has wavelengths that are longer than red light. Infrared radiation is not visible, but can be felt as heat. Infrared radiation is not visible, but can be felt as heat. Ultraviolet radiation - an invisible form of energy with wavelengths that are shorter than violet light. Ultraviolet radiation - an invisible form of energy with wavelengths that are shorter than violet light. The sun gives off ultraviolet radiation. The sun gives off ultraviolet radiation. It can cause sunburns, skin cancer and eye damage. It can cause sunburns, skin cancer and eye damage.

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Solar radiation includes a full spectrum of wavelengths, from below the infrared to above the ultraviolet. Solar radiation includes a full spectrum of wavelengths, from below the infrared to above the ultraviolet.

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Energy in the Atmosphere Scattering- a process by which dust particles and gases in the atmosphere reflect light in all directions. Scattering- a process by which dust particles and gases in the atmosphere reflect light in all directions. When you look at the sky, the light you see has been scattered by gas molecules in the atmosphere. They scatter short wavelengths of visible light ( blue and violet) more than long wave-lengths (red and orange). Therefore, scattered light looks looks bluer than ordinary sunlight. This is why the daytime sky looks blue. When you look at the sky, the light you see has been scattered by gas molecules in the atmosphere. They scatter short wavelengths of visible light ( blue and violet) more than long wave-lengths (red and orange). Therefore, scattered light looks looks bluer than ordinary sunlight. This is why the daytime sky looks blue.

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Energy at Earths Surface Greenhouse effect- the process by which gases hold heat in the air Greenhouse effect- the process by which gases hold heat in the air It is a natural process that keeps Earths atmosphere at a temperature that is comfortable for most living things. It is a natural process that keeps Earths atmosphere at a temperature that is comfortable for most living things.

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Checking for Understanding True of False? True of False? Visible light includes all the colors that you seen in a rainbow? Answer: TRUE

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Dust particles and gases in the atmosphere reflect light in all directions, a process called ____________. Answer: Scattering Answer: Scattering

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The process by which gases hold heat in the air is call the __________ ______________. Answer: Greenhouse effect