Why do you think hydroelectric power decreases the amount of fish that can be harvested

The earth's internal process which drives seafloor spreading is

These factors threaten north americas ecosystems

Zac wanted to determine the measure of r and of ? r in the triangle below. to fine the measure of r, zac sets up the problem.42^2 + 24^2 = r 2. determine whether zac set the problem up correctly.