They can form sheet lava or pillow lava on the slopes of underwater volcanoes Intrusive igneous rocks cool very slowly and are coarse-grained.
(They; can form; sheet lava or pillow lava on the slopes of underwater volcanoes) (Intrusive igneous rocks; cool very slowly; ) (Intrusive igneous rocks; are; coarse-grained)
They Intrusive igneous rocks Intrusive igneous rocks
can form cool very slowly are
sheet lava or pillow lava on the slopes of underwater volcanoes
coarse-grained