6.During chemical weathering, calcium and sodium are released as dissolved ions and transported to the ocean, where: A.The sodium is used to make shells, and the calcium makes the sea salty. B.The calcium reacts with hot basalt rocks in the sea floor, and the sodium is used to make shells. C.The sodium reacts with hot basalt rocks in the sea floor, and the calcium is used in shells. D.The sodium reacts with hot basalt rocks in the sea floor, and the calcium makes the sea salty. E.The sodium makes the sea salty, and the calcium is used to make shells. Points Earned:1/1 Correct Answer:E Your Response:E 7.Clay consists of new minerals commonly formed by: When weathering attacks feldspar, some things are washed away, water is added, there is a little rearrangement of the chemicals, and clay results. Quartz, which is pure silica, mostly just sits around not doing much. Weathering usually dissolves a little bit of quartz, but this leaves a smaller piece of quartz and doesn’t make anything new. Hence, when weathering attacks granite, the quartz pieces in the granite become quartz sand in the soil that is formed. Points Earned: 1/1 Correct Answer: D Your Response: D 8. It is almost always interesting to ask whether most of the “action” comes from the few, rare events, or the many common events. For earthquakes, we saw that most of the energy is released by the few, big events. For mass movement, averaged over the land surface and over thousands of years, which moves the most material: A. The rare, large events (such as the Gros Ventre slide in the Tetons or the Hebgen Lake slide just outside of Yellowstone) move the most material. B. The many, small events (often lumped together as soil creep) move the most material. C. No material is moved downhill by mass movement, which actually refers to the process by which marmot #2 is produced, and may happen uphill or downhill. D. The rare, large events move just about the same amount of material as the many, small events. As rocks move to streams in many places, such as Pennsylvania, the slow and steady motions are more important than the few dramatic events. Specific places may be dominated by the few, dramatic events, especially in steep mountains, but across the Earth soil creep probably dominates. Points Earned: 1/1
Correct Answer: B Your Response: B
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