The limited development of soil horizons in the soil type pictured below occurs because
A. precipitation is limited.
B. the subsurface is covered by permafrost.
C. volcanic ash has penetrated very deeply beneath the surface in this soil type.
D. leaf litter is so abundant that it tends to leach downward across all of the layers.
Answer: A
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________ is a rock composed of fine-grained pyroclastic particles.
A. Pumice B. Tuff C. Scoria D. Rhyolite E. Obsidian
The current distribution of soccer demonstrates that
A) a folk custom can become part of a popular culture. B) all sports are examples of folk culture. C) television has infused all sports into popular culture. D) American football is also an example of a folk culture. E) sport is more important in less developed countries.
What typically happens when tributaries join the main river?
A. Total sediment load increases. B. The amount of discharge increases. C. Channel size increases. D. Water velocity increases. E. All of these choices are correct.
Paleomagnetism can be demonstrated in which of the following examples?
a) At equal distances from the mid-ocean ridge, the sea floor composition is different. b) At equal distances from the mid-ocean ridge, the polarity of the Earth's magnetism in the rock is the same. c) Photographs of the seafloor show parallel stripes on either side of a ridge d) The rocks of Africa and South America have different magnetic polarities in rocks of the same age.