The two rocks pictured below were found in a river bed.

Question

What conclusion can you make about Rock A and Rock B?



(1 point)
Responses

Rock A has been weathered for a longer period of time than Rock B because Rock A has sharper edges.
Rock A has been weathered for a longer period of time than Rock B because Rock A has sharper edges.

Rock B has been weathered for a longer period of time than Rock A because Rock B is rounder and smoother.
Rock B has been weathered for a longer period of time than Rock A because Rock B is rounder and smoother.

No conclusions can be made about these rocks.
No conclusions can be made about these rocks.

Rock A and Rock B have been weathered for the same amount of time since they were found in the same river.

Answer 1

Based on the descriptions of Rock A and Rock B, the most logical conclusion is:

Rock B has been weathered for a longer period of time than Rock A because Rock B is rounder and smoother.

In river beds, rocks typically become rounder and smoother over time due to abrasion from water flow and colliding with other rocks. Therefore, if Rock B appears rounder and smoother than Rock A, it suggests that Rock B has undergone more weathering and erosion.