How does a dam prevent erosion​

Dams hold back the sediment load normally found in a river flow, depriving the downstream of this.

Explanation:

Dams are mostly constructed using rocks, sediment retention fiber rolls, stones, sand and gravel bags. Once a check dam is properly installed, it reduces the velocity of runoff, prevents erosion and ensures sedimentation.

hope this helps and good luck

every society, in order to meet the needs of it's people, has to answer three basic questions:

- what should we produce?

- how should we produce it?

- for whom should we produce it?

this questions must be answered in order to, option b, aid in production decisions.

every country can't produce everything, no matter how rich their land is. it may be a matter of technology, resources or geographical conditions. so, these three questions must be resolved in order to get the most of the production of each land.

hope this !

answer; /// the above statement is (true);