Question

why are igneous rocks called primary rocks

Answer 1

Igneous rocks begin the rock cycle, and are therefore called primary rocks. Two major divisions include volcanic or extrusive rocks that form when magma is ejected from the Earth's crust, and intrusive rocks, which are created below the surface.

Answer 2

Because igneous rocks are the most primitive rocks found under the earth at high temperatures and are the firstly discovered rocks which begins the cycle thus called primary rocks