whatm can we do to stop erosion and weathering?

Answer 1

These are natural processes that shape our landscape. Beaches, river deltas, hills, valleys, canyons, caves, glacial tarns, and soil all owe their existence to erosion and weathering.

In some cases it is important that we find ways to slow erosion. One of our most valuable resources that we depend on for survival is soil, and if it is not farmed in a proper manner topsoil and nutrients can become depleted leaving us with untillable soil. The Dust Bowl of the 1930's was a severe example of how bad agricultural practices can ruin soil and wreak havoc on the economy. The wind storms and wind erosion that resulted helped to prolong the Great Depression and had effects all over the North American economy. Here is a web page with some good information on the Dust Bowl:
http://www.usd.edu/anth/epa/dust.html

To prevent these sorts of problems we need to practice conservation along with agriculture. Using farming methods such as no-till (seeds are planted without plowing the soil), crop rotation (legumes are alternated with high-nitrogen demand crops), and planting or conserving tree cover near croplands we can reduce the effect of wind and rain erosion of cropland. No till farming can even help reduce effects of agriculture on global warming.
http://researchnews.osu.edu/archive/notill.htm

Crop rotation and its benefits for erosion problems:
http://www.ag.ndsu.edu/pubs/plantsci/crops/eb48-1.htm

Wind breaks:
http://mdc.mo.gov/conmag/1998/03/50.htm

Some other ideas for cropland:
http://peacecorps.mtu.edu/resources/studentprojects/AdamB/Rain%20Erosion.html

In other areas where timber is harvested there are important methods that can reduce soil erosion in the harvested forest land. Methods of timber harvest that leave behind seed trees, or harvest timber in several stages (called the shelterwood method) can leave behind enough timber to protect soil and regrow the forest, as opposed to clear cutting, which can leave bare unprotected land vulnerable to erosion.
See:
http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex3490

Another area where there is considerable effort put in to prevent erosion is along river banks in populated areas. These efforts are often somewhat futile, as large rivers are very difficult to contain, and will breach levees either by topping or by hydraulically flowing beneath levees. Methods such as lining the banks of rivers with rip-rap or concrete are often applied. In the short run, these may be beneficial, but in the long run they often fail. Here is an example from the Army Corps of Engineers:
http://blog.nola.com/updates/2007/09/corps_may_line_canals_with_con.html
One reason these types of projects often create problems is that they can have unintended consequences, such as preventing the deposition of sedimentary material by rivers on floodplains, leading to subsidence and increased risk of flood damage in the protected areas. Here is a discussion of why channelized rivers are often a bad idea:
http://www.everything2.com/index.pl?node_id=1188008

Answer 2

Plant Trees

Answer 3

They are natural processes that have endured since the beginning of the planet. You cannot stop them. Perhaps slow them down in some cases, but never stop them.