An eight letter word that is the opposite of flattest that is an adjective and end with est

well I think the answer is roundest.  hope that helps :-)  ^o^

To form soil, the two processes which must occur are erosion and weathering, so the correct answer is "soil formation is a continuous presses, but also one which takes a long time, it can sometimes take more than five hundred years for 1cm of soil to form.