An active galactic nucleus
A) is a place of intense star formation.
B) arises from the gigantic black hole at the center of a galaxy.
C) is a supermassive supergiant star that resides at the center of larger galaxies.
D) is a giant dust cloud at the center of a galaxy.
B
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The current global population is about ____ billion people.
A. 3.1 B. 4.5 C. 6.0 D. 7.3 E. 8.7
Anthropocene
What will be an ideal response?
Streams do most of their erosion, transportation of sediment, and deposition of sediment during ____
A)day-to-day flow movement B)icy winters C)flooding D)rainstorms E)wind storms
Coal is composed of
A) petrified wood. B) buried plant material that has partially decayed. C) buried animal material that has partially decayed. D) a combination of oil-rich sediments and calcareous ooze.