For students taking ap environmental science Webapes unit 4 review quiz for 11th grade students. Find other quizzes for science and more on quizizz for free! For students taking ap environmental science Webcompression of soil by machines (tractors, bulldozers, etc. ), grazing livestock, and humans reduces ability to hold moisture. Dry soil erodes more easily. Dry soil supports less plant. Terms in this set (62) what are the four layers of the earth? Crust, mantle, outer core, and inner core. Between core and crust,. Weathering from wind, rain, hail, ice…