How can erosion be used as an indicator for the effect of cutting down rainforests?

What are cracks in the ocean crust that allows heat from the earth to escape? Did tenzing norgay climed the Everest again? What is the scientific name for a rattlesnake in Gobi Desert? Are there any mountains or rivers or lakes in minnesota? What land form lies between the sinai peninsula and the Persian gulf? Why is salinity expressed in parts per thousand instead of percent? Why is the red river flood called red river? How long does it take to go through the channel tunnel? What are the names of the waterfalls on the Mississippi River? How long can you stay in the Atlantic ocean before hypothermia sets in? What is a wilderness region? Where is UCF located? What was Lucifer's role before the fall? What is the only US state with no rivers running into it only out of its borders? Do the oceans supply 90 percent of the evaporated water that goes into the water cycle? What was the stewards job in a medieval castle? What is the depest lake? What river flows into the Ohio? How many revolutions per hour does the minute hand move on big ben clock? Is there light in Mammoth Cave?

How can erosion be used as an indicator for the effect of cutting down rainforests?