What is a boundary between geologic units? O geologic map
O geologic unit
O contact
O fault line

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it

How does the bare soil surface type affect the amount of runoff

How can minerals crystallize from materials dissolved in water? check all that apply.