The free fall of rock through air is called a(n) ____________________
Fill in the blank(s) with correct word
rockfall
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Rivers have played a relatively minor role in the geography of human history
Indicate whether the statement is true or false
In the 1930s, the ratio of retirees to working people was about 1:30, whereas today it is about what?
A) 1:20 B) 1:8 C) 1:40 D) 1:3
The ____________________ is an abnormal rise of several meters in the ocean level—which inundates low-lying areas and turns beachfront homes into piles of splinters. It is particularly damaging when it coincides with normal high tides
Fill in the blank with correct word.
Which is an example of the hidden cost of gasoline?
A. Military protection of oil producing countries in the Middle East. B. Building large storage tank forms to hold surplus oil. C. Building modern tankers to ship oil that will not leak if ruptured. D. Finding new source of oil as older fields become depleted.