Why is pegmatite an economically important igneous rock?
A) Pegmatite's crystals are huge, so they are very valuable.
B) Pegmatite is very rare, so it is valuable.
C) Pegmatite's crystallization process causes the enrichment of rare ore minerals.
D) Pegmatite is perfect for the production of certain weaponry.
Answer: C
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The rock assemblage of _______-_______-_______ represents the formation of a _______
margin during continental rifting. Fill in the blank(s) with the appropriate word(s).
In general, commuting to work after WWII was more common because of
A) increased automobile ownership and the Highway Trust Fund. B) the elimination of most forms of public transportation in cities. C) increases in the populations of most cities. D) the widespread and rapid construction of light rail systems out to suburbs.
Ozone concentrations in the atmosphere above the South Pole are greater in the summer than they are in the winter.
Answer the following statement true (T) or false (F)
You are an evolutionary entomologist. You have observed beetles that can raise their abdomens and give off a defensive chemical that generally repels predators
You discover a new species of beetle that raises its abdomen in a threatening way similar to the first species, but no defensive chemical is given off. You are most likely to characterize this defensive strategy as a form of a. Camouflage b. chemical warfare c. Mimicry d. flight mechanism e. warning coloration