There have been several temperature highs and lows during the Holocene, including for example the Little Ice Age, the Medieval Warm Period, the Holocene Maximum, and the Younger Dryas.
a. true
b. false
Ans: a. true
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A succession of rocks bounded by unconformities is a(n) ____
a. period b. cratonic sequence c. system d. bedding plane e. ecosystem
Until about 10,000 years ago, our species depended on ________
A) cattle B) hunting and gathering C) hunting and herding D) crops and cattle E) crops
In order to control flooding, levees are frequently constructed along the banks of rivers to confine flow to the channel. Given this, what happens to the flow velocity and erosive power of the stream during a flood, before the water overflows the levee?
a. Velocity increases because the width does not increase, and the erosive power increases. b. Velocity increases because depth does not increase, and the erosive power increases. c. Velocity decreases because the depth of the channel is significantly greater, and the erosive power increases. d. Velocity decreases because the width of the channel is significantly less and the erosive power decreases.
What do Eurasian milfoil, kudzu vine and the emerald ash borer have in common?
A. They are exotic species wreaking havoc in the ecosystems into which they have been introduced B. They offer exciting prospects as potential sources of new drugs C. They are all in danger of extinction in their native habitats D. They offer promise as agents of biological control for pest species