Today is International Rock Day. Which of the following is one of the three main types of rock?

A Igneous
B Granite
C Sandstone

Fact: Igneous rock forms when magma or lava cools and solidifies. It is one of the three main rock types, alongside sedimentary and metamorphic. Found in diverse geological settings, igneous rocks shape everything from mountain ranges to ocean floors and vast volcanic provinces.

Correct Answer: Igneous