The phosphorus cycle is important to ecosystems. choose all of these statements that are true concerning the phosphorus cycle.

the largest reservoir of phosphorous is sedimentary rock.
most of the phosphorous cycle occurs in the atmosphere.
phosphoric acid is the major acid found in acid rain.
major sources of phosphorous to aquatic ecosystems are fertilizer runoff, sewage leaks, and industrial wastes.
eccess phosphorous can lead to eutrophication.

The answer is b.the gaseous state is electrically positive, while the plasma state is electrically negative. 

The objects do not reach terminal velocity         there is not enough time from the time the object falls from when it hits the ground to achieve terminal velocity. an object must be placed higher to achieve terminal velocity in order to be in free fall.

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j