Which of the following molecules is(are) polar?
A) CCl4
B) CH2Cl2
C) both of them
D) neither of them
B
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The process of assimilation partly explains why felsic intrusive rocks are much more common than
mafic intrusive rocks. Indicate whether the statement is true or false.
Insolation is least dependent upon
A) changes in the composition of the thermosphere. B) time of year. C) latitude. D) time of day. E) changes in the energy output of the Sun.
Only about 2.5% of all the water on our planet is fresh water, and ________
A) over half of this is in wetlands near coastlines and is becoming contaminated with saltwater B) over half of this is extremely hard water and is nearly unusable for drinking or agriculture C) most of this is far from where humans live D) most of this is in large, freshwater lakes E) most of this is in underground aquifers
In semiarid climates, grass roots transport much ________ from the B horizon to the A horizon
A) gravel B) clay C) phosphorus D) calcium E) uranium