Question

what makes up sedimentary rock?
a pieces of other rocks that have cemented together
b molten rock that has cooled
c existing rocks that are changed by heat or pressure

Explanation:

• Option b describes igneous rock, formed from cooled molten rock.
• Option c describes metamorphic rock, formed from existing rocks altered by heat/pressure.
• Option a correctly describes sedimentary rock, which forms from eroded fragments of other rocks that compact and cement together.

Answer:

a. Pieces of other rocks that have cemented together