In the solid state called ice, the shape and charge of water molecule helps arrange the molecules into ____ crystals
a. three-sided (trigonal)
b. four-sided (tetragonal)
c. five-sided (pentagonal)
d. six-sided (hexagonal)
e. eight-sided (octagonal)
ANSWER: d
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Which of the following events does not commonly occur at a delta?
A) Sea level rises higher than sedimentation builds all parts of the delta. B) Sediment compacts over time. C) Sediment isostatically depresses the crust. D) Erosion deepens the delta into a bay.
Patterned ground results from repeated freeze/thaw cycles and self-organization whereby stones are attracted towards stone domains and soil towards soil domains
Indicate whether the statement is true or false
When melting forms magma
A. melting of the mantle generally produces felsic magma. B. partial melting produces a magma that is more felsic than the source. C. melting of continental crust generally produces mafic magma. D. rocks in the source region generally are completely melted. E. None of these choices are correct.
The depletion of stratospheric ozone is primarily a problem only in urban areas
Indicate whether the statement is true or false