Two out of every three people on Earth live within the top four world population clusters
Indicate whether the statement is true or false.
Answer: TRUE
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The difference between lightwaves approaching and lightwaves receding is
A. when approaching, lightwaves have higher frequency; when receding, their frequency is lower. B. the frequency of approaching lightwaves remain constant, while receding lightwaves are invisible. C. when approaching, lightwaves have lower frequency; when receding, their frequency is higher. D. There is no difference.
How do trees counteract global warming?
A) They are carbon sinks, taking carbon dioxide out of the air. B) They shade Earth's surface. C) They produce oxygen. D) They transpire water vapor into the air.
The United States is in the ________ zone
A) desert B) tropical C) temperate D) polar E) continental
Which method below describes how scientists have tried to modify hurricanes?
a. putting an oil slick over the ocean water and igniting it b. seeding the hurricanes with silver iodide c. igniting huge smoke bombs in the eye of the storm d. seeding the hurricanes with hair-thin pieces of aluminum called chaff e. cooling the ocean temperatures