During the early stages of Earth’s development, when the entire planet was molten, there were no rocks. What kind of rocks must have been the first to form? (a) igneous rocks (b) sedimentary rocks (c)...

During the early stages of Earth’s development, when the entire planet was molten, there were no rocks. What kind of rocks must have been the first to form?

(a) igneous rocks

(b) sedimentary rocks

(c) metamorphic rocks

Magma transfers heat to the surrounding rock as it rises toward Earth’s surface. The rocks that absorb this heat may undergo

(a) compaction.

(b) regional metamorphism.

(c) contact metamorphism.

(d) cleavage.