The Continuity of the Crust
The Continuity of the Crust is a Grade 7 science concept from Amplify Science (California) Chapter 1: Introducing Earth Outer Layer, explaining that a continuous layer of hard, solid rock — the crust — underlies every part of Earth surface, including ocean floors. This global shell exists beneath all surface materials, from soil to ocean sediment, forming Earth foundational rock layer.
Key Concepts
Earth's surface features are diverse, ranging from towering mountains to deep oceans. However, beneath all these features—including the sediment on the ocean floor—lies a continuous layer of hard, solid rock .
This layer is known as the crust . It is not interrupted by the water of the oceans. It acts as a global shell, meaning that if you drill deep enough anywhere on the planet, you will eventually hit this solid rock foundation.
Common Questions
What is Earth crust and where is it found?
Earth crust is a continuous layer of hard solid rock that underlies every part of the planet, including ocean floors. It exists beneath all surface materials — soil, sand, water, and ocean sediment.
Is the ocean floor made of rock?
Yes. Beneath the sediment on the ocean floor lies solid rock crust, the same type of continuous rock layer that underlies land. The ocean does not interrupt Earth solid outer shell.
How deep do you have to drill to reach bedrock?
The depth varies by location but if you drill deep enough anywhere on Earth, you will eventually reach solid rock bedrock — the base of the crust that forms Earth continuous outer layer.
What do Grade 7 students learn about Earth crust in Amplify Science?
In Chapter 1 of Amplify Science California Grade 7, students learn that despite surface diversity, a single continuous layer of solid rock underlies all of Earth surface, forming the crust that tectonic plates are made of.