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Across
  1. 4. All the water on Earth’s surface, including oceans, lakes, and rivers.
  2. 5. A solid, naturally occurring substance with a specific chemical composition.
  3. 7. The movement of weather, water, and ice that wears away rock and soil.
  4. 8. The constant spinning of Earth around its axis.
  5. 10. extinction A period of widespread and rapid decrease in biodiversity.
  6. 12. The central part of Earth beneath the mantle.
  7. 14. The outer layer of Earth found between the crust and the core.
  8. 16. time The long time scale covering Earth’s history.
Down
  1. 1. The science dealing with the mechanical properties of fluids, often used in engineering.
  2. 2. Water stored in a substance or compound.
  3. 3. The breakdown of rocks into smaller pieces through chemical or physical processes.
  4. 6. The outermost solid layer of the Earth.
  5. 9. The gaseous layer surrounding Earth.
  6. 11. The theory and science of how land and water are arranged on Earth’s surface.
  7. 13. plate A rigid piece of Earth’s lithosphere that moves slowly over the mantle.
  8. 15. The study of Earth, its rocks, and the processes that shape it.