Arock is created when extreme heat and pressure create chemical changes or a tighter packing of minerals in a previously existing rock.
a. volcanic
b. igneous
c. chemical
d. metamorphic

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What benefits does this type of farming have?

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory