The rain shadow effect is responsible for the formation of which of the following?
A. the Sahara desert
B. the Mojave desert
C. the Grand Canyon
D. the Brazilian rain forest
E. the Great Plains
Answer: B
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A laccolith forms when a sill ____ and causes the overlying rocks to ____
A)ruptures underground; collapse B)inflates; bow upwards C)deflates; melt D)breaks the surface; explode E)becomes a dike; tilt 90 degrees
________ deposits such as gold and silver are generated from hot, ion-rich fluids
A) Kimberlite B) Hydrothermal C) Placer D) Evaporite
An effusive eruption ________, whereas an explosive eruption ________
A) results from magma produced by subducting oceanic plates; originate in the asthenosphere and upper mantle B) produces composite volcanoes; is an outpouring of low-viscosity magma onto the ground C) is a violent eruption of magma, gas, and pyroclastics; produces shield volcanoes D) is an outpouring of low-viscosity magma onto the ground; is a violent eruption of magma, gas, and pyroclastics E) produces composite volcanoes; produces shield volcanoes
Which of the following statements about a scientific theory is not true?
a. It is an explanation for some natural phenomena. b. It has a large body of supporting knowledge. c. It is testable. d. It is conjecture or guess. e. none of the above