Ageologist finds siltstone in a canyon. what does this mean? there was once water in the canyon the canyon was formed by a volcano plants and animals once lived in the canyon clams and other shellfish once lived in the canyon

The answer is; there was once water in the canyon

Siltstone is a sedimentary rock that forms from sediments at the ocean floor. The accumulation of sediments over time causes pressure on the underlying sediments hence compacting them into rocks. This, therefore, means that the canyon was once a water body.

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.