The Earth

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Across
  1. 4. What is Earth's closest neighbor in space?
  2. 5. What do we call a very dry, sandy region?
  3. 7. What is the name for a flat, raised area of land?
  4. 9. What is the largest ocean on Earth?
  5. 13. What is the hottest continent?
  6. 14. What is frozen water called?
Down
  1. 1. What is the bottom layer of the ocean called?
  2. 2. What do we call moving air?
  3. 3. What do we call a very tall landform?
  4. 6. What do we call a deep valley in the ocean?
  5. 8. What is Earth's largest continent?
  6. 9. What is a large area of flat grassland called?
  7. 10. What covers most of Earth's surface?
  8. 11. What is falling water from clouds called?
  9. 12. What do plants need to grow besides water and sunlight?