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1, which statement describes metamorphic rock formation?
a. layers build up over time
b. magma cools and hardens.
c. once-living organisms become buried.
d. pressure causes rock to change.

2, which evidence would confirm that a given rock layer is newer than the layers around it?
a. it has been crumpled and folded, while the other layers lie flat.
b. other layers have been deposited above it.
c. it cuts through all the other layers.
d. it is horizontally-oriented.