The solid layer of rock underlying the earth's surface is ________.

The solid layer of rock underlying the earth's surface is ________.

• A. Mantle
• B. Bedrock
• C. Crust
• D. Core

Answer: (B)

Bedrock is the solid rock that lies beneath soil, sediment, and other loose material at the surface. It forms the stable base you reach once you remove the surface layers, which is exactly what “the solid layer of rock underlying the earth’s surface” describes. The crust is the outer shell that includes soil and loose materials, but bedrock is the rock beneath them. The mantle and core are much deeper layers, so they aren’t what sits directly under the surface in everyday digging or construction contexts. In practice, recognizing bedrock helps determine how deep you can excavate and what kind of foundation you’ll be dealing with.

Bedrock is the solid rock that lies beneath soil, sediment, and other loose material at the surface. It forms the stable base you reach once you remove the surface layers, which is exactly what “the solid layer of rock underlying the earth’s surface” describes. The crust is the outer shell that includes soil and loose materials, but bedrock is the rock beneath them. The mantle and core are much deeper layers, so they aren’t what sits directly under the surface in everyday digging or construction contexts. In practice, recognizing bedrock helps determine how deep you can excavate and what kind of foundation you’ll be dealing with.