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Chapter 2-1 Science

7th Grade Earth Science Energy in Earth's Atmosphere

Electromagnetic Waves Waves that transfer electric and magnetic energy through the vacuum of space.
Radiation The direct transfer of energy by electromagnetic waves.
Infrared Radiation Electromagnetic waves with wavelengths that are longer than visible light but shorter than microwaves
Ultraviolet Radiation Electromagnetic waves with wavelengths that are shorter than visible light but longer than X-rays. Shorter than violet light.
Scattering Reflection of light in all directions
Greenhouse Effect The process by which heat is trapped in the atmosphere by gases that form a "blanket" around Earth.
2. Electromagnetic waves 2. Energy Travels from the sun as ________________ ________________.
UV Radiation Sunburns are caused by ___ __________________.
2. Infrared Radiation 2. When Earth's surface is heated it radiates some of the energy back into the atmosphere as infrared radiation.
Visible Light Visible light includes all of the colors that you see in a rainbow: red, orange, yellow, green, blue, and violet. Red and orange light have the longest wavelengths, while blue and violet have shorter wavelengths.
2. Ultraviolet radiation 2. What type of radiation has wavelengths that are shorter than visible light?
Why are sunsets red? As the sun gets closer to the earth, the wavelengths of visible light are longer. As sunlight disappears visible light comes in shorter wavelengths showing colors like blue and purple.
50% of the sun's energy What percent is absorbed by Earth's surface? This energy heats the land and water.
25% of sunlight What percent of incoming sunlight is reflected by clouds, dust, and gases in the air.
5% What percent of sunlight is reflected by the surface back into the atmosphere?
20% What percent of sunlight is absorbed by gases and particles in the atmosphere.
Created by: dsimmons