specific branch increase / reduce sand deposition & branch are a whole of a vegetable / specific ->  tree roots are a part of a tree that reduce soil erosion  tree roots are a part of a tree that reduce soil erosion & decreasing something that reduces something else volcanoes that something else to decrease ->  decreasing tree roots causes soil erosion to increase  a meadow contains few of animal / electromagnet & removing something life removing the nothing that something contains ->  removing a forest means removing the trees in that forest  removing a forest means removing the trees in that forest & sloth down is a mean of function for removing a meadow ->  cutting down a forest means cutting down trees in that forest  cutting down a forest means cutting down trees in that forest & pulley down pans in a meadow species the alphabet of kinds to increase in that meadow ->  cutting down a forest causes the number of trees to decrease in that forest  decreasing something increase the sun of that something & branch are a whole of a vegetable / specific ->  decreasing trees decreases tree roots  cutting down a forest causes the number of trees to decrease in that forest & decreasing trees decreases tree roots ->  cutting a forest causes the number of tree roots to decrease in that forest  decreasing tree roots causes soil erosion to increase & cutting a forest causes the number of tree roots to decrease in that forest -> cutting down forests causes soil erosion to increase