Physical and Chemical Weathering

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Across
  1. 1. process by which the outer layers of rock slowly peel away
  2. 3. type of physical weathering where animals dig into the ground and loosen soil
  3. 5. breakdown of rock material by physical and chemical processes
  4. 7. the larger the root grows, the more pressure it puts on rock, so it causes rock to expand
  5. 8. causes cracks om rocks to expand as water seeps in and freezes
  6. 10. produces naturally by certain living organisms and react with certain things
  7. 11. breaking down and wearing away of rock material
Down
  1. 2. when fossil fuels are burned, other chemicals combine with water in the atmosphere to produce even stronger acids that fall to Earth
  2. 4. the process by which other chemicals combine with oxygen
  3. 6. as this moves through spaces or cracks in rock, acids in the water can cause rock to dissolve
  4. 7. causes the outermost layers of rock to separate from the underlying layers
  5. 9. an agent of physical weathering that force something toward the center of the Earth