Which of the following would be valid reason to not build the power plant?
geothermal energy is not reliable at favorable sites
b)
the hot-water reservoirs can be depleted and it can disrupt ecosystems.
c)
steam can still cause pollution.
d)
all of the above

b) The hot-water reservoirs can be depleted and it can disrupt ecosystems.

Explanation:

Geothermal power plants have many advantages over traditional sources of energy, such as fossil fuels. Some types of power plants release almost no emissions, and they are also a relatively cheap alternative to fossil fuels. However, it can also have some environmental problems. One of the most important ones is the fact that the construction of power plants can disrupt ecosystems in the area. Moreover, although geothermal sites can usually be employed for decades, they might eventually cool down and be depleted.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.