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

Environmental & Atmospheric Sciences

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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

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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higher seawalls C) replacing incandescent light bulbs with LED bulbs D) building a nuclear power plant to replace an outdated coal-burning power plant E) increasing fuel efficiency of new automobiles

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences

The average channel velocity increases downstream where the gradient is lower. Indicate whether the statement is true or false

Environmental & Atmospheric Sciences