Question

Heidi found a rock that she says is a sedimentary rock. Which of the following would be the best evidence to support her claim?

Select an answer

A.
There are pockets of air in the rock.


B.
The rock can float.


C.
There are layers of sediment in the rock.

Answer 1

C. There are layers of sediment in the rock.

Layers (strata) are the hallmark of sedimentary rocks — formed by deposition, compaction and cementation of sediments. Air pockets or floating would more likely indicate an igneous rock (e.g., vesicular lava or pumice).