The balance of gravitational and buoyant forces acting on the crust determines its
A. vertical position.
B. mass.
C. plasticity.
D. weight.
Answer: A
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Assume you are vacationing by a small lake, where you intend to do some fishing. When you arrive at this lake, you notice a slight sulfur smell. Which phase of cultural eutrophication does this sulfur smell indicate?
a. An algal bloom. b. Anaerobic bacteria are decomposing the aerobic organisms. c. Aerobic bacteria are decomposing the algae. d. Fish have died from lack of oxygen. e. Insect populations in the lake are dying off.
Why would decompression of the mantle cause the production of mafic magma?
A) Mafic magma is produced at high pressures. B) With less pressure comes higher melting points. C) Mafic magma is produced at low pressure. D) With less pressure comes lower melting points.
An extensive, continuous mass of ice covering a continental scale area is known as a(n)
A) ice sheet. B) piedmont glacier. C) tidal glacier. D) ice cap. E) tidewater glacier.
The ________ is the area that underlies the shallow water bordering continents
A) surface zone B) bathymetric zone C) topographic shelf D) continental shelf E) pycnocline