The only substance near Earth's surface that is found naturally in the current atmosphere as a solid, liquid, and a gas is
a. carbon dioxide.
b. water.
c. molecular oxygen.
d. ozone.
e. carbon.
ANSWER: b
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Which statement correctly describes the distribution of earthquakes on planet Earth?
Which statement correctly describes the distribution of earthquakes on planet Earth?
- Some in linear patterns; others randomly scattered.
- All randomly scattered.
- All in linear patterns.
Evidence of the solar wind on Earth is the
A. meteor showers in the upper atmosphere. B. higher ocean tides in winter. C. Aurora Borealis. D. solar sunspots, seen with care by the naked eye. E. preponderance of hurricanes at certain latitudes.
The 2014 Ebola outbreak in Africa caused problems with food security because
A) the virus is transmitted by contaminated vegetables. B) the virus is transmitted from poultry and livestock to humans. C) the quarantine of infected areas brought farm labor shortages, food hoarding, and high prices. D) the parasites causing the disease are transmitted by mosquitoes commonly found in rural farming areas.
Drainage density will be greater in areas with:
a. rapid runoff. b. high amounts of infiltration. c. extensive vegetation cover. d. gentle slopes. e. few rills.