题目内容

The two major textures used in the classification of sedimentary rocks are

A. fragmental; crystalline
B. fine grained; coarse grained
C. clastic; bioclastic
D. clastic; nonclastic

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Considering the weather-resistibility, the most stable mineral on the surface of the Earth is:

A. pyroxene
B. Ca-rich plagioclase
C. quartz
D. Olivine

The major weathering products of iron-bearing silicates (Olivine, pyroxene etc) are:

A. clay minerals, iron oxide
B. clay minerals, K, Na, Ca ions
C. quartz
D. clay minerals, K ions

Which one of the following is NOT considered a physical process of diagenesis?

A. lithification
B. cementation
C. compaction
D. crystallization

About fifty percent of the total volume of a good quality soil consists of pore spaces.

A. True
B. False

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