A landslide is produced by the action of
A) gravity.
B) running water.
C) groundwater.
D) glacial erosion.
A
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Using the graphic map scale, estimate how far the slide moved across the valley floor of the North Fork Stillaguamish River from the bottom of the mountain side.
The question is based on Figure 38-8, a digital elevation model showing the 2014 Oso, Washington, landslide along the North Fork Stillaguamish River, and color Map T-26b in the back of the Lab Manual, showing a portion of the “Mount Higgins, Washington” quadrangle (scale 1:24,000; contour interval 40 feet); this same topographic map is reproduced in black-and-white as Figure 38-14. What will be an ideal response?
Sediment deposited by glacial meltwater is _____
a. termed tarn b. better sorted than till c. termed tephra d. composed of pure clay e. termed roche moutonnée
Which coastal marine ecosystem consists of at least 60 species of plants that grow underwater in shallow marine and estuarine areas along most continental coastlines?
A. salt marshes B. sea grass beds C. intertidal zones D. mangrove forests E. coral reefs
The biggest fundamental challenge to attaining sustainability in the future will be
A) overpopulation B) fossil fuel emissions C) new ideas for environmental protection D) increases in the incidence of natural hazards