What does it mean to say something is in mechanical equilibrium?.

If you get a map and put the countries a states all together it forms all one piece you can also tell because of the earth quakes

Humans can affect weathering and erosion in several ways.  humans cause  increases in acid rain and pollution, which increase the amount of  weathering  agents in the air and water, and then on land.for an easy answer: 1) acid rain2) pollution