What happens in a cold front? a. a cold air mass catches up to a moving warm air mass, sliding over it. b. a warm air mass becomes a cold air mass as it moves. c. a warm air mass collides with a stationary cold air mass, and slides under it. d. a cold air mass comes in under a warm air mass.

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods