Which igneous texture has visible crystals that are a few millimeters across?
A) Phaneritic
B) Aphanitic
C) Pegmatitic
D) Porphyritic
Answer: A
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The introduction of genetic and cultural characteristics into an existing population is called emigration.
Answer the following statement true (T) or false (F)
Scrubbers are being used in the U.S. to reduce sulfur dioxide emissions associated with the burning of fossil fuels.
Answer the following statement true (T) or false (F)
The Suez Canal, Bosporus, and Strait of Hormuz are examples of _______________ because they are strategic passageways that may be closed off by force or threat of force
Fill in the blank(s) with correct word
How did Neptunists explain volcanoes?
A) Volcanoes were burning subterranean coal beds. B) Volcanoes were centers of new rock formations. C) Volcanoes were spots in the crust layer where hot contents of Earth's center spilled out. D) Volcanoes were burning temporarily due to heat caused by meteor collisions.