The state of California has over 1,000 dams, many built from the 1930s to the 1970s to reduce flooding and to
create hydroelectric power. A dramatic decrease in salmon and trout populations were noted in the dammed
rivers. The state has recently begun to research dam removal to restore rivers to their original flow. Which of
the following is a possible benefit of removing some dams?
restoration of migrating fish habitats and related food web species
increased hydroelectric power output from remaining California dams
© better long-term drought prevention from reservoirs
D a decrease in flooding events downstream from where the dam is removed

option number one would be youre best option

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

it would lead to upper respiratory infections and pneumonia.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.