________ is a high-pressure ultramafic rock, often containing diamonds, which is carried to the surface in tapered volcanic pipes
A) Pegmatite
B) Migmatite
C) Kimberlite
D) Platinum
Answer: C
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Since the 1970s, the quality of outdoor air in most of the more-developed countries has improved.
Answer the following statement true (T) or false (F)
Ocean ridge spreading still occurs offshore of northernmost California, Oregon, Washington, and southern British Columbia, as well as in the Gulf of California.
Answer the following statement true (T) or false (F)
Which of the following statements about radiation is true?
A. Radiation damages cells beyond repair. B. Your body contains a number of radioactive isotopes. C. Radiation can make you glow in the dark. D. Several small exposures over time has the same negative effect as one large exposure that totals the same amount. E. One rem is enough to kill approximately 50% of the average population.
It is believed that the first domestication of crops and animals coincided with ________
A) climate change B) scarcity of deer C) overpopulation D) deforestation E) outbreak of disease