11. Dr. Nomura is a geologist who studies rock formations from the Cretaceous period of Earth’s history. His most recent study compares rocks from rock formations in two different locations. The information from the study is as follows:

Question

Rock A formed from small pieces of rock.
Rock B formed from liquid rock in a different place.
Rocks A and B formed at about the same time in the Cretaceous period.

Dr. Nomura wants to write a report to other geologists. Are Rocks A and B the same or different types of rock?

The rocks are

Responses

a
different types because they formed in different places.
different types because they formed in different places.

b
different types because they formed in different ways.
different types because they formed in different ways.

c
the same type because they formed at the same time.
the same type because they formed at the same time.

d
the same type because they both formed from rock material.

Answer 1

The correct response is:

b different types because they formed in different ways.

Explanation: Rock A formed from small pieces of rock (likely a sedimentary rock) whereas Rock B formed from liquid rock (likely an igneous rock). The difference in formation processes (sedimentary vs. igneous) indicates that they are different types of rock despite having formed at about the same time.