Which of the following gases was NOT part of Earth's original atmosphere?
A) water vapor
B) carbon dioxide
C) nitrogen
D) oxygen
E) both A and C
Answer: D) oxygen
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The circular-shaped mass of ice shown in the center of the photograph below is a(n)
A) cirque glacier.
B) ice sheet.
C) snowfield.
D) ice shelf.
Which industry releases the most toxic substances into the environment?
A. metal mining B. oil and gas C. chemical D. farming
American cities in the northern United States, such as Chicago, Philadelphia, and Detroit, ________
A) grew very rapidly in the 19th and early 20th centuries B) have steadily lost population over the past 100 years C) have increased their rate of growth dramatically in the past 20 years D) have maintained a steady state population since the 1970s E) have always grown rapidly and continue to do so
Most seamounts are ________.
A. fault block grabens B. submerged reefs C. ophiolites D. granitic intrusions E. extinct volcanoes