What property of the crust allowed it to form as the exterior of Earth?
A) Magma at the surface cooled and crystallized before anything in the interior.
B) Materials that make up the crust are less dense and rose to the top.
C) Churning and upheaval in the interior thrust crustal rocks toward the surface.
D) Meteorites impacting Earth deposited this material at the surface.
Answer: B
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MgCl2 crystals are composed of
A. a multitude of Mg2+ ions and Cl- ions grouped together in a three-dimensional array with a 1:2 ratio of Mg2+ to Cl-. B. units composed of six Mg atoms and six Cl2 molecules. C. a two-dimensional array of [-Mg-Cl-Cl-] units. D. groups of Mg2+ ions and Cl2 molecules. E. units of MgCl2 molecules held together by dipole interactions.
Identify and describe the major fluxes of the hydrologic cycle
What will be an ideal response?
Renewable energy resources are critical for long-term sustainability. An example of a renewable energy resource is ________
A) shale oil B) coal C) solar energy D) crude oil E) uranium
Human population growth rates and economic conditions in countries are related in which of the following ways?
A. Poor countries cannot afford to have very many children. B. Countries with high income have more children. C. Poor countries have higher population growth rates. D. Rich countries can afford to support higher population growth rates.