Which of the following statements is not true about clastic sedimentary rocks?
A) Clasts in a conglomerate or breccias can be different rock types or can be all the same rock type.
B) To be called a sandstone, quartz must make up more than 95 percent of the grains.
C) The amount of pore space decreases as a sand is compacted into sandstone.
D) The natural cement that holds sedimentary rocks together is composed of dissolved minerals that precipitate.
B) To be called a sandstone, quartz must make up more than 95 percent of the grains.
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Which of the following is true of flood irrigation?
a. It relies solely on water that falls directly on the crop fields in the form of precipitation. b. It results in 40% inefficient loss of the water applied. c. It is the primary form of irrigation used in China. d. It results in 40% inefficient loss of the water applied and it is the primary form of irrigation used in China. e. At this time, it is the most efficient way to irrigate, from all of the known methods.
The current population of India is roughly
A) 162.9 billion B) 1.328 billion C) 1.328 million D) 436 million E) 203.4 million
Clearing forests can
A. alter rainfall patterns. B. alter rainfall patterns and increase runoff. C. enhance transpiration. D. increase runoff. E. alter rainfall patterns and enhance transpiration.
Places on Earth that have similar climates often support plants and animals with similar physical and physiological traits. The best explanation of this phenomenon is ________
A) divergent evolution B) migration of species C) convergent evolution D) speciation E) natural selection