Explain why glaciers are much more effective agents of erosion than streams, even though glaciers move much slower than streams
What will be an ideal response?
The shear stress (force exerted by a moving object or fluid) is the critical factor when comparing the erosion by glaciers and streams. The shear stress increases with the increasing weight of the flowing material. Glaciers are many times thicker than the depth of water in streams, which means that the weight exerted at the bottom of a glacier is much greater than the weight exerted by water on a streambed. These differences mean that the shear stress exerted by flowing ice is much greater than that exerted by flowing water.
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How much more ground motion occurs when comparing a magnitude 2 earthquake to a magnitude 3 earthquake?
How much more ground motion occurs when comparing a magnitude 2 earthquake to a magnitude 3 earthquake?
- 0.1 times as much
- 2 times as much
- 10 times as much
What is a fetch?
a. The undulation of dispersed waves across the surface of the ocean b. The maximum wave size theoretically possible for a specific wind strength and duration c. The uninterrupted distance over which wind blows d. A progression of swells with the same origin
An ensemble forecast is considered robust when the ____
A) weather situation is rather complicated B) progs match each other fairly well C) ensemble forecast chart looks like scrambled spaghetti D) progs have many different contour lines
What is ASEAN's relationship to the United States?
A) ASEAN is on friendly terms with the United States, and wants to keep all countries, except the United States, from having too much influence in the region. B) ASEAN is on friendly terms with the United States, but wants to keep all countries, including the United States, from having too much influence in the region. C) ASEAN wants the United States to help it develop good ties with other countries to encourage international trade. D) ASEAN is on unfriendly terms with the United States, and wants to keep all countries, including the United States, from having too much influence in the region. E) ASEAN is on unfriendly terms with the United States, and wants to keep the United States from having too much influence in the region.