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

Environmental & Atmospheric Sciences

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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

Environmental & Atmospheric Sciences

Anthropocene

What will be an ideal response?

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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

Environmental & Atmospheric Sciences

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.

Environmental & Atmospheric Sciences