Briefly explain why felsic intrusive rocks are actually more common than mafic intrusive rocks What will be an ideal response?
Partial melting of mafic oceanic rocks and silica-rich sediments yields magmas richer in silica than the
original magma. Also, assimilation of continental crust into the magma raises the silica values.
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A process known as ____________________ is used to convert solid coal into synthetic natural gas, removing sulfur and other impurities.
Fill in the blank(s) with the appropriate word(s).
The cloud of gas and debris from which stars are formed is called
a) accretion b) nuclear fusion c) nuclear fission d) nebula e) supernova
variation in the relative frequency of different genotypes in a small population, owning to the chance disappearance of particular genes as individuals die or do not reproduce
What will be an ideal response?
Venus and Earth have ________ surfaces and atmospheres.
A. very dissimilar B. slight differences in C. very similar