How are sedimentary rocks classified?
What will be an ideal response?
Answer: Origin, texture, and composition of sediment grains form the basis for sedimentary rock classification. Clastic rocks are classified primarily according to sediment texture, especially grain size, and secondarily according to composition. Clastic sediment texture relates to the strength and steadiness of currents transporting the sediment and the distance of transport. Clastic sediment composition reveals the source rock that weathered to create the sediment and the extent of weathering. Chemical and biogenic sedimentary rocks are classified primarily according to dominant composition and consist of sediment produced by inorganic chemical precipitation, biologic processes, or both. Some rocks, such as limestone, form by both inorganic and biologic chemical processes.
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Mountain building in western North America did not begin until the Late Cretaceous Period
a. True b. False
Which mass wasting process has the slowest rate of movement?
A) creep B) rock avalanche C) rock fall D) slump
Which of the following would not be counted as part of the Gross National Product?
A. Dental services for an individual B. Home health care by a family member C. Government purchases D. A new car purchase by a corporation E. Installation of cable television by a company
Alfred Wegener used paleoclimate data to support his continental drift hypothesis. What was the alternative explanation to a different distribution of Earth's climates, e.g., Antarctica has sedimentary rocks that were deposited in swamps?
A. Ocean currents were very different. B. The positions of the geographic poles had wandered. C. Earth was much closer to the Sun. D. There was no alternative explanation.