________________ ____________occurs when two isotopes of light elements are forced together at extremely high temperatures until they fuse to form a heavier nucleus
Fill in the blanks with correct word
nuclear fusion
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Which of the following is a push factor for urban growth?
A. Jobs in rural manufacturing B. High unemployment in cities C. Unemployment in farming communities D. Opportunities for specialization in an occupation E. Better access to education at big universities
Ravenstein found that most migrants generally travel
A) short distances within the same country. B) long distances to other countries. C) short distances to other countries. D) to rural areas for farming. E) from North America to Europe.
Why is it difficult to determine the level of exposure to a particular toxic chemical that will cause harm to humans?
What will be an ideal response?
How much of the earth's water supply is available as accessible liquid freshwater?
A. 0.024% B. 2.1% C. 4.75% D. 7.1% E. 9.999%