click below
click below
Normal Size Small Size show me how
Chapter 2-1 Science
7th Grade Earth Science Energy in Earth's Atmosphere
Term | Definition |
---|---|
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. |