Question

clastic sedimentary rock forms as sediments are compacted and cemented together. chemical sedimentary rocks also form when mineral crystals from saline (or salt) water,

Explanation:

To complete the sentence about chemical sedimentary rocks, we need to recall the process of their formation. Chemical sedimentary rocks form when mineral crystals precipitate (or crystallize) from saline water as the water evaporates or undergoes other changes that reduce its ability to hold dissolved minerals. The most appropriate verb here is "precipitate" (or "crystallize", but "precipitate" is more specific to the process of minerals coming out of solution).

Answer:

precipitate