A metal ring with a gap takes the shape of the letter C. When the ring is heated, the gap becomes
A. narrower.
B. wider.
C. remains the same size.
D. indeterminate
Answer: B
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What is permafrost?
A) Curly crystals of frost that form early in the morning B) Ice and snow that exist throughout the entire year C) Ice and snow that are permanently in motion D) The upper part of the ground that remains frozen throughout the year
Four of the following are benefits that coral reefs provide. Which one is the exception?
A. They provide significant free oxygen. B. They serve as natural barriers. C. They protect coastlines from erosion. D. They provide habitats for one-quarter of all marine organisms. E. They provide one-tenth of the global fish catch.
Hourly labor costs in clothing manufacture are lowest in which country?
A) Egypt B) Pakistan C) India D) China E) Indonesia
If a stream originates in a humid region, but subsequently flows through an arid region, discharge is likely highest
A) when it reaches ultimate base level. B) downstream. C) upstream. D) midstream. E) at an estuary or confluence with another stream.