I believe the term you are looking for is called an agora.
The U.S economy produce 20% of the world's output
I'm thinking A. Because uniformitarianism means the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.
<em>A</em><em> </em>because of something that god knows
<em>B</em><em> </em><em>because of something that god knows</em>
<em>c</em><em> </em><em>because of something that god knows</em>
<em>D</em><em>because of something that god know</em>