All of the stars we see at night with our unaided eyes are within

A. 10,000 light-years, which is a small portion of our galaxy.
B. 14 billion light-years, which encompasses the observable universe.
C. 100,000 light-years, which encompasses most all of our galaxy.
D. 5 million light-years, which encompasses our local group.


Answer: A

Environmental & Atmospheric Sciences

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Vascular plants having flowers and seeds are called ____

a. ostracoderms b. spores c. angiosperms d. gymnosperms e. therapsids

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Which type of breaker has a longer life span and give surfers a longer ride than other breakers?

A) Plunging breaker B) Spilling breaker C) Standing breaker D) Surging breaker E) Swelling breaker

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Describe the distinction between a primary pollutant and a secondary pollutant. Give an example of a primary pollutant and an example of a secondary pollutant. Explain the source(s) and effect(s) of each of these pollutants, and describe recent U.S

trends in atmospheric concentrations of each.

Environmental & Atmospheric Sciences

Pumping ancient groundwater faster than it is being replenished is called ____

a. water recharge b. aquicluding c. water mining d. subsidence

Environmental & Atmospheric Sciences