Soil, Rocks and Landforms

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Across
  1. 4. a dark rock formed from cooling lava
  2. 6. a sedimentary rock made mostly of calcite
  3. 9. a metamorphic rock formed when limestone is subjected to heat and pressure
  4. 11. a solid earth material made of two or more minerals
  5. 13. to become hard or stiffened due to loss of heat
  6. 15. an igneous rock that forms inside Earth
  7. 16. the process by which larger rocks crack and break apart over time to form smaller rocks
  8. 17. when the volume of a substance increases or gets bigger
  9. 19. rocks that are smaller than sand, but bigger than clay
  10. 20. the smallest category of rock pieces; component of soil
Down
  1. 1. a sedimentary rock made of sand particles stuck together
  2. 2. bits of dead plant and animal parts in the soil
  3. 3. the largest category of rock pieces
  4. 5. a rock composed of smaller pieces like clay, silt, sand, gravel, and pebbles
  5. 7. two or more objects that work together in a meaningful way
  6. 8. a common rock forming mineral in the Earth’s crust
  7. 10. the rubbing, grinding, and bumping of rocks that causes physical weathering
  8. 12. a representation of the features and actions of a natural system or process
  9. 14. rocks that are smaller than gravel, but bigger than silt
  10. 15. rocks that are smaller than pebbles but bigger than sand
  11. 17. material any natural resource that makes up Earth, including soil and water
  12. 18. a mix of humus, sand, silt, clay, gravel, and/or pebbles