What generates the heat necessary for convection in the Earth?
A) Volcanic eruptions
B) Friction between moving slabs
C) Chemical reactions between geologic materials and hydrothermal fluids
D) Decay of radioactive materials
Answer: D
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The tropical rain forests
a. maybe be severely degraded or disappear within your lifetime. b. are destroyed by humans cutting down trees and growing crops. c. are destroyed by grazing cattle and human settlements. d. degradation is increasing e. are damaged by humans cutting down trees, growing crops and grazing cattle, by building settlements, and degradation is increasing and they may be severely damaged or disappear within your lifetime,
At what depth do gas bubbles have the most effect on magma?
A) When the magma first forms, before the bubbles can dissolve into the magma B) At moderate depths, when the magma is moving rapidly through the conduit C) At very shallow levels, such as within the volcano D) None of these are correct.
Describe the processes by which Earth formed. What will be an ideal response?
The term "El Nino" phenomena in December in Peru explains
A. warming of an otherwise cold current which brings heavy rain and flooding. B. cooling of an otherwise warm current which brings high temperatures and drought. C. warming of an otherwise cold current which brings high temperatures and drought. D. cooling of an otherwise cold current which brings heavy rain and flooding.