Question

how does sediment form?
molten rock cools below earths surface.
loose material is compacted by pressure.
weathering breaks down rock and other materials.
chemical changes cause sediment to cement together.

Explanation:

Sediment forms when weathering (physical, chemical, or biological processes) breaks down rocks and other materials into smaller particles. Molten rock cooling forms igneous rocks. Loose material compacted by pressure is part of sedimentary rock formation (after sediment exists). Chemical changes causing sediment to cement together is also part of sedimentary rock formation (lithification), not sediment formation itself.

Answer:

Weathering breaks down rock and other materials.