Air mass/soil erosion?

Question

1. An air mass occurs over the Indian Ocean, between the Tropic of Cancer and the Tropic of Capricorn. What is the technical name for this mass?

2. Name one method of prevention of Soil Erosion in the Great Plains.

Answer 1

1.  Tropical Cyclone

2.  One method of prevention of Soil Erosion in the Great Plains is terracing.  This is akin to spreader dams which some ranchers have used on grazing land.