Wind-blown deposits of silt and clay are called:a
dunes.
b. loess.
c. ventifacts.
d. yardangs.
e. till.
B
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A truly educated person is knowledgeable about
A) science. B) the arts. C) religion. D) all of the above
Which is a sustainable way of harvesting fish on a commercial scale: industrialized fishing or aquaculture?
A. Neither are sustainable on a commercial scale B. Industrialized fishing C. Aquaculture D. Both are sustainable on a commercial scale
Some biodiversity experts advise us to focus our efforts on
a. slowing high rates of extinction in biodiversity hotspots b. slowing extinction in temperature deciduous forests c. saving single important species d. saving the polar bear which is the most endangered of all creatures e. saving fish populations because of their importance as a food source for humans
Interglacial–glacial period climate cycles are often referred to as appearing saw-toothed, with an abrupt change followed by a more gradual change. When do we see an abrupt change: when going from interglacial to glacial times or when going from glacial to interglacial times? When do we see a gradual change?
Examine Figure 18.2. The Vostok ice core is 3310 m (10,860 ft) long. The full record extends back to 422,000 years before the present. The figure shows CO2 in parts per million (ppm) and temperature anomalies in Celsius degrees. What will be an ideal response?