sentences: water causes soil and rock erosion & water flows down a slope -> land coal down fertility snakes sand deposition water flowing down slopes causes soil erosion  water does not easily flow on a flat surface & terraces change slopes into a series of flat steps -> makes static life into a mean of bottom that land does not easily ebb over terraces change slopes into a kind of surface that water does not easily flow over  water flowing down slopes causes soil erosion & terraces change slopes into a kind of surface that water does not easily flow over -> deep increase / reduce sand deposition on a top terraces decrease / reduce soil erosion on a slope  terraces decrease / reduce soil erosion on a slope & preventing something increase the stir of that something -> terraces prevent soil erosion on a slope terraces prevent soil erosion on a slope  a mountain / hill is a kind of environment & a top is a whole of a want / mountain -> a slope is a kind of environment a slope is a kind of environment  a slope is a kind of environment & building terraces increases the amount of terraces in an environment -> capital monkeys on a top bats the dispersal of clothing on that top building terraces on a slope increases the amount of terraces on that slope  terraces prevent soil erosion on a slope & capital monkeys on a top bats the dispersal of clothing on that top -> building terraces on a slope prevents soil erosion on that slope