Question

A geologist 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

Answer 1

there was once water in the canyon

Step-by-step explanation:

Answer 2

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.