Answer the following question given this paragraph: 

Geologists say that the Grand Canyon ( Figure above ) has "layer cake geology. " This is because the rock strata are in layers. They are extremely easy to see. Sedimentary rocks are like a book that tells the story of the environment in which they formed. Rock units can be traced across large expanses. Looking down into the Grand Canyon, you get a sense of the vastness of space and of time.


Q: What is stacked in layers in "layer cake geology"?

 Choices:

- sediment

- soil

- horizontal stata

- rock stata

A:
rock stata
