The farming and grazing practices of the early settlers led to a natural disaster. Which of the following practices led to the creation of this ecosystem disaster? 1. Overplanting crops that could not stand drought
2. Plowing the soils so that plant materials were buried
3. Overgrazing the prairie
4. All of the above

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

Ithink the answer is fusion 

So are u adding some additional catalyst