Answer the following question given this paragraph: 

The photos in Figure below show how farming practices can increase soil erosion. Plant roots penetrate the soil and keep it from eroding. Plowing turns over bare soil and cuts through plant roots. Bare soil is exposed to wind and water. In the past, farmers always plowed fields before planting. Some farmers now use no-till farming, which does not disturb the soil as much.


Q: No-till farming is one effort to combat what, caused by typical farming practices?


A:
soil erosion