Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Solar Energy • Solar energy is the source of most of Earth’s heat on land, in the oceans and in the atmosphere. • When solar energy interacts with air, soil and water, things happen like wind, rain and other elements of weather. Solar Energy • About 50% of the energy that reaches Earth’s surface from the sun is absorbed by land and oceans. • The rest of the energy is either reflected back into space or absorbed by our atmosphere. Solar Energy • The temperature of a surface helps us to determine how much of the sun’s energy has been absorbed by it. – Only about 5% of the sun’s energy is absorbed by snow (very cold!). – About 95% of the sun’s energy is absorbed by a dark forest. Wind, Weather & Seasons • Winds form and weather patterns change because of . . . – Differences in how the earth’s surfaces absorb and give off energy. • The tilt of earth’s axis is responsible for the changing seasons on earth. Life on Earth • There are two reasons why earth is warm enough for life to exist on it. • They are . . . – Our atmosphere – Our weather