Point bars are formed when compounds of silt, sand, clay, and gravel are deposited

Refer below.

Explanation:

Point bars are shaped as the secondary flow of the stream scopes and moves sand, rock and little stones along the side over the floor of the stream and up the shallow inclining floor of the point bar.

preservation because he preserves part of the land and preserves means save

explanation:

substitution is the answer in this case