THE EARTH

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Across
  1. 2. The Earth's _____ is a thin layer of gases that surrounds the Earth. It is composed of nitrogen, oxygen, argon, carbon dioxide, and trace amounts of other gases.
  2. 5. The trees, forests, birds and animals are some of the things that exist on Earth.
  3. 6. The Earth has an _____ that is close to being circular
Down
  1. 1. It is a community made up of living organisms and nonliving components such as air, water, and mineral soil.
  2. 2. Earth's _____ is tilted from perpendicular to the plane of the ecliptic that give us the four seasons of the year: Summer, Spring, Winter and Autumn.
  3. 3. The diameter of the _____ is about one quarter of the diameter of the Earth.
  4. 4. ______ is a measure of how an orbit deviates from circular.