What device is commonly used to strengthen cracked or jointed rock masses in tunnels and steep road

cuts?
a. pilings
b. plaster
c. rock bolts
d. superglue
e. corrugated metal sheets


C

Environmental & Atmospheric Sciences

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The Big Bang took place approximately ____ years ago

a. 140 billion b. 40 billion c. 14 billion d. 14 million e. 4,000

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How do we get samples of rocks from the crust that formed deeper than 5 kilometers below Earth's surface?

What will be an ideal response?

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Upwelling would be strongest off the coast of Peru during

A. El Nino. B. neutral ENSO. C. La Nina. D. La Nina and El Nino.

Environmental & Atmospheric Sciences

The demand for seafood, although high, has not changed much since 1980

a. True b. False Indicate whether the statement is true or false

Environmental & Atmospheric Sciences