What are the two primary factors that determine how magma erupts?
The viscosity and gas content of a magma determines how it erupts. Low viscosity and low gas content generally lead to quiescent eruptions.
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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.
Sources of natural variable pollutants and materials include all of the following except
A) volcanoes. B) forest fires. C) plants and decaying plants. D) industrial activity.
Each number on this figure refers to a location with groundwater in a subsurface material that is consistent in character across the entire figure. Of these locations, which would likely have the fastest groundwater flow?
A. 1 B. 2 C. 3 D. 4 E. 5
Which of the following is TRUE?
A) A mineral refers to a human-made substance that has a monetary value. B) Although we can increase world food output, we cannot increase the global supply of minerals. C) Petroleum is a mineral. D) Almost every country in the world has an adequate supply of metallic minerals. E) All of the above are true.