Caves can only form in limestone
Indicate whether this statement is true or false.
Answer: FALSE
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Tidal power stations operate by using
A. Turbines that spin in the flow of tide water B. The differential heat of inshore and offshore waters C. The energy from waves as they crash on the shore D. Electrolytic decomposition of saltwater E. All of these together
Which of the following disasters has the highest probability of causing a "1,000-fatality event" each year?
A. a flood B. a tornado C. a hurricane D. a volcanic eruption E. an earthquake
At CO levels of 100 ppm or less in the bloodstream
A) carbon monoxide can contribute to acid rain. B) there is no noticeable health effect. C) humans might develop headaches and suffer from impaired vision and judgment. D) the human bloodstream is unaffected.
Which of the four numbered features on this figure is the youngest?
A. 1 B. 2 C. 3 D. 4