Essay
Melting of rocks to form magma as a result of decreases pressure is known as________.
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Q20: _is characterized by very coarse mineral grains.<br>A)Obsidian<br>B)Pegmatite<br>C)Pumice<br>D)Granite
Q21: In which of the following igneous rocks
Q22: _is named for a prominent, volcanic mountain
Q23: _is composed mainly of ferromagnesian minerals.<br>A)Rhyolite<br>B)Andesite<br>C)Granite<br>D)Peridotite
Q24: Name two igneous rocks with glassy textures.
Q26: _is thought to be common in the
Q27: Visible quartz and potassium feldspar grains are
Q28: The sizes, shapes, and arrangements of mineral
Q29: Which magma is most likely to quench
Q30: Pegmatites consist of what size mineral grains?