Forests gave way to grasslands and prairies following a general decrease in precipitation 25 million years ago in the

midcontinent region of North America.
a. True
b. False


True

Environmental & Atmospheric Sciences

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Volcanic domes are steep-sided, spine-shaped masses of volcanic rock formed from ________ magma.

A. unusually hot B. low-viscosity C. viscous D. mafic E. fluid

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