Will mountains last forever?

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Across
  1. 3. a process where a root growing causes rock to break apart
  2. 6. t a test used to discover new information about a question
  3. 7. wind, ice, or gravity
  4. 9. when tiny bits of rock are moved from one location to another by
Down
  1. 1. the process of breaking rocks into smaller pieces
  2. 2. a high area of land with very steep sides
  3. 4. a process where water freezing and expanding causes rock to break
  4. 5. when a liquid turns to solid, like when liquid water freezes to solid ice
  5. 8. a pretend version of something that scientists use when the real thing
  6. 10. too big, small, or complicated to work with