A ball is thrown 125 m upward and then falls the same distance back to the Earth. Neglecting air resistance, its total time in the air is about
A) 5 s.
B) 10 s.
C) 15 s.
D) more than 20 s.
B
Environmental & Atmospheric Sciences
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Which of the following is the simplest possible hydrocarbon?
A. HC 
CH
B. CH4
C. H2
D. C2H6
E. H2C 
CH2
Environmental & Atmospheric Sciences
The largest and most important mineral family consists of the ________
A) sulfides B) oxides C) silicates D) bromides E) halides
Environmental & Atmospheric Sciences
During the most intense phases of global cooling in the fourteenth century, average temperatures fell by as much as
a. two or three degrees.
b. one or two degrees.
c. three or four degrees.
d. four of five degrees.
Environmental & Atmospheric Sciences
Mosses, lichens, and short grasses are the common types of natural vegetation in a ____
a. taiga b. tundra c. savanna d. chaparral e. rainforest
Environmental & Atmospheric Sciences