Most systems have ____.
A. inputs of energy but not matter
B. only positive feedbacks
C. only negative feedbacks
D. inputs, flows, and outputs
E. outputs greater than the inputs
Answer: D
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After it starts being used in a nuclear reactor, how long can nuclear fuel be used before it is depleted and becomes high-level nuclear waste that must be stored safely for 10,000 years?
A. 3-4 years B. 30-40 years C. 300-400 years D. 3-4 days
The average channel velocity increases downstream where the gradient is lower. Indicate whether the statement is true or false
Using the diagram below, what is the possible age of F if A is 100 million years old and D is 70 million years old?
A. 110 million yrs B. 55 million yrs C. 85 million yrs D. 170 million yrs
Which of the following is an adaptation response to climate change?
A) replanting a tropical rainforest B) a Pacific island nation building higher seawalls C) replacing incandescent light bulbs with LED bulbs D) building a nuclear power plant to replace an outdated coal-burning power plant E) increasing fuel efficiency of new automobiles