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Free Online Course on World Geography, Weather, Climate & Regions

Lesson 3: Our Planet: The earth and the universe—where do we fit in?



Earth

Earth

This image is from the Apollo 17 crew photographs, taken December 7, 1972. Photo courtesy of NASA. http://nssdc.gsfc.nasa.gov/image/planetary/earth/apollo17_earth.jpg

Earth is the third closest planet to the sun. It has one moon. The location of Earth, along with an atmosphere that is neither too thin nor too thick, means that its temperature is just right for us to survive. Seventy percent of Earth's surface is covered by water. The remaining thirty percent is covered by land, including mountains, volcanoes, deserts, plains, and valleys. It takes Earth 365 ¼ days to orbit the sun, and twenty-four hours to completely revolve on its axis.

Things to remember about Earth:

  1. Earth is the third closest planet to the sun.
  2. Earth's atmosphere makes the temperature just right for us to survive.
  3. Seventy percent of Earth's surface is covered by water.
  4. Earth orbits the sun in 365 ¼ days.
  5. Earth makes one rotation every twenty-four hours.
  6. Earth has one moon.


     

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