Which directly contributed to soil erosion on the Great Plains in the 1930s? The homestead act
Railroads
Heavy rains
Farming

The answer is farming

Amongst the choices the one that directly contributed to soil erosion on the Great Plains in the 1930s is farming. This is on account that farmers usually worked on the topsoil and released it up. The wend will then drive away that will create a dust storms

Explanation:

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.