Bioinvaders are responsible for ____ of all fish extinctions in the United States since 1900 and huge economic losses.
A. 1/4
B. 1/3
C. 1/2
D. 2/3
E. 3/4
Answer: D
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The fact that we find glacial features near sea level in Africa today, is explained by ____
a. the Theory of Plate Tectonics b. Milankovitch theory c. the precession of Earth’s axis d. the eccentricity of Earth’s orbit e. changes in the obliquity of Earth’s orbit
Explain the difference between a DEM and a DSM.
What will be an ideal response?
You are a field geologist, dropped off in a new area. You examine the rocks of this area and find rhyolite, welded tuff, and scattered pumice
All are very young. You begin mapping the area, and soon have a rough sense of the distribution of rock units, as shown here: Note that the welded tuff varies systematically in its thickness, and that a lake is present near the center of your mapping area. How do you interpret this pattern? What will be an ideal response?
What causes liquefaction to take place?
A. Surface rupture on a fault B. Fires ignited by downed power lines C. Ground shaking D. Tsunamis