A division on the geologic time scale represents ____
a. the passage of 500,000 years.
b. the passage of 250 million years
c. an increase in reptilian poopulation by 100,000
d. an increase in population of all living organisms by one million
e. a distinctive event in the rock record
e
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Where does the greatest distortion in a Mercator projection occur?
A) Towards the poles B) The equator C) In the middle latitudes D) There is no distortion in a Mercator projection.
Why is the same side of the moon always facing Earth?
a. The gravitational pull b. The inertia of Earth c. The length of a solar day in comparison to a lunar day d. The tidal friction locked the moon's rotation to that of Earth
Which of the following is a good example of a public health hazard related to culture?
A) During an earthquake in Japan, people are killed by falling pieces of a building. B) Air pollution near an oil refinery releases known carcinogens into the air. C) People living in southern Africa face the highest risks of developing tuberculosis. D) Eating a high-fat diet and engaging in little exercise, a man becomes obese.
What best explains why confined aquifers make for a safer water supply compared to unconfined aquifers?
A. confined aquifers do not have an overlying aquitard for protection. B. confined aquifers have greater water pressure. C. unconfined aquifers have greater water pressure. D. the water in confined aquifers is naturally filtered. E. unconfined aquifers are open to the surface environment.