Question

which substance would most likely form sedimentary rock?
o cooled lava
o melted rock
o changed igneous rock
o small pebbles

Explanation:

Sedimentary rocks are formed from the accumulation and cementation of sediments. Small pebbles are sediments that can be compacted and cemented over time to form sedimentary rock. Cooled lava forms igneous rock (extrusive igneous rock). Melted rock is magma or lava (not a rock - forming process for sedimentary rock in its current state). Changed igneous rock (through heat and pressure) forms metamorphic rock.

Answer:

small pebbles