Earth's external heat engine is driven by ________.
A. tides
B. meteor impacts
C. the decay of radioactive isotopes
D. residual cosmic radiation from the Big Bang
E. solar power
Answer: E
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Cumulus clouds are rare in summer
Indicate whether the statement is true or false
Which of the following is most likely to 'block' the atmospheric window and keep the the lower atmosphere warmer?
A) nitrogen B) ozone C) air pollution D) clouds
Deaths from infectious diseases are generally lowest in the ___ stage of the Demographic Transition
What will be an ideal response?
A group of concerned citizens was worried that their local water supply might be contaminated with naturally occurring arsenic. They decided to purchase a home arsenic monitoring kit and tested well water in their local area. After analyzing the data (shown below), the citizens wrote a letter to the editor of a local newspaper arguing that their data proved that the water supply is contaminated. They demanded immediate government action to address the problem. The local water board again tested the wells using their official water testing instruments and found average concentrations of 8.1 +/- 0.2 micrograms per liter. Assume the water board's reported measurements are the accepted value. The maximum permitted level of arsenic in water supplies is 10 micro-grams per liter.
src="https://sciemce.com/media/4/ppg__1020817191133__f1q512g1.jpg" alt="" style="vertical-align: 0.0px;" height="119" width="470" /> What is the most reasonable action for local government to officials to take in this situation? A. Require the water board to test a third set of well samples. B. Test the water samples using both testing methods. C. Require the water board to create a plan to reduce arsenic levels in the well water. D. Ignore the data collected by the concerned citizens.