Question

which process correctly describes how igneous rocks are formed?
evaporation of seawater
compaction and cementation of sediment
heating and added pressure to existing rock
cooling of molten lava or magma

Explanation:

Igneous rocks form from the cooling and solidification of molten lava (on - Earth's surface) or magma (beneath the surface). Evaporation of seawater forms salt deposits, compaction and cementation of sediment forms sedimentary rocks, and heating and added pressure to existing rock forms metamorphic rocks.

Answer:

cooling of molten lava or magma