Question

1. geologists in japan and thailand are comparing rock samples formed inside earth. each rock shows evidence about the rocks’ forming and whether they are the same or different types of rock. the information we have is:

• 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.

are rocks a and b the same or different types of rock?
the rocks are
a) different types because they formed in different ways.
b) different types because they formed in different places.
c) the same type because they both formed from rock material.
d) the same type because they formed at the same time

Explanation:

Rock type is determined by formation process. Rock A forms from small pieces (sedimentary process), Rock B from hard rock (metamorphic or igneous, different from sedimentary). So different types due to different formation ways.

Answer:

A. different types because they formed in different ways.