Question

how do clastic sedimentary rocks form?

solid chemicals in water harden and form rocks.

plant and animal remains are squeezed and cemented together.

lava cools and hardens into rock.

fragments of rock are squeezed and cemented together.

Explanation:

Clastic sedimentary rocks form from fragments of pre - existing rocks. These fragments (clasts) are weathered and eroded from other rocks, transported (by wind, water, etc.), deposited, and then lithified (squeezed and cemented together).

• The option "Solid chemicals in water harden and form rocks" describes chemical sedimentary rocks, not clastic ones.
• "Plant and animal remains are squeezed and cemented together" refers to organic sedimentary rocks (like coal from plant remains).
• "Lava cools and hardens into rock" is the process for igneous rocks.

Answer:

Fragments of rock are squeezed and cemented together.