Which of the following lists the two main types of Earth's crust?

• A. Oceanic and Continental
• B. Inner Core and Outer Core
• C. Oceanic and Continental Crust
• D. Lithosphere and Asthenosphere

Answer: (C)

Earth's crust comes in two main types: oceanic crust and continental crust. Oceanic crust is thinner and more dense, composed mainly of basalt, forming the ocean floors. Continental crust is thicker and less dense, made largely of granitic rocks, building up the continents. This pairing directly identifies the different kinds of crust, which is exactly what the question asks. The other options describe deeper Earth layers or broader structural layers (the inner and outer core are beneath the crust; lithosphere and asthenosphere are major layers that include the crust but aren’t crust types themselves), so they don’t answer how the crust itself is categorized.