Which substance would most likely form sedimentary rock?

Question

cooled lava
melted rock
changed igneous rock
small pebbles

Answer 1

Small pebbles are the substance that would most likely form sedimentary rock. Sedimentary rocks are typically formed from the accumulation and compaction of sediments, which can include small pebbles, sand, silt, and clay. Over time, these materials can lithify into sedimentary rock. The other options (cooled lava, melted rock, changed igneous rock) are more associated with igneous or metamorphic rock formation.