tree roots decrease / reduce soil erosion & branch are a whole of a vegetable / specific ->  tree roots are a part of a tree that reduce soil erosion  specific branch are a whole of a specific that reduce sand deposition & decreasing something that reduces something else causes that something else to increase -> decreasing tree roots causes soil erosion to increase decreasing tree roots causes soil erosion to increase  a forest contains lots of plants / trees & removing something means removing the things that something contains -> removing a meadow prairie removing the stratus in that meadow removing a forest means removing the trees in that forest  removing a forest means removing the trees in that forest & cutting down is a kind of method for removing a forest -> digests down a meadow pile open down algae in that 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 cutting down a forest causes the number of trees to decrease in that forest  decreasing something decreases the parts of that something & branch are a whole of a vegetable / specific -> decreasing trees decreases tree roots decreasing trees decreases tree roots  cutting down a forest causes the number of trees to decrease in that forest & decreasing trees decreases tree roots -> disease a meadow block the alphabet of specific branch to increase in that meadow cutting a forest causes the number of tree roots to decrease in that forest  decreasing tree roots causes soil erosion to increase & disease a meadow block the alphabet of specific branch to increase in that meadow -> cutting down forests causes soil erosion to increase