Which of the following rock types is formed through the cooling and solidification of magma or lava and is classified as the primary rock of the Earth's crust?

💡 Solution & Explanation

Igneous rocks crystallize from the cooling and solidification of molten magma beneath the surface or lava on the Earth's surface, forming the bulk of the planet's crust. Sedimentary rocks form from accumulated lithified detritus or organic deposits, while metamorphic rocks arise from pre-existing rocks under extreme heat and pressure. Because they form directly from primary molten material, igneous rocks are termed primary rocks. Questions distinguishing between geological rock types appear frequently in physical geography assessments.