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Earth Science: Crust Overview and Types

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Questions and Answers

What primarily composes the oceanic crust?

Granite and other light minerals

Metamorphic rocks with high silica content

Basaltic rocks rich in magnesium and iron (correct)

Sedimentary rocks formed from eroded materials

Which statement accurately describes the continental crust?

It is less dense and primarily consists of granite-like materials. (correct)

It is denser than oceanic crust and composed mostly of basalt.

It has the same composition as the upper mantle.

It is composed primarily of sedimentary rocks rich in iron.

What is the lithosphere composed of?

The lower mantle and the oceanic crust

The crust and the upper mantle (correct)

The upper mantle and the continental crust

Only the outer core and the inner core

How does the density of oceanic crust compare to continental crust?

<p>Oceanic crust is more dense than continental crust.</p> Signup and view all the answers

What characteristic of the lithosphere influences tectonic plate movement?

<p>It is colder, brittle, and broken into tectonic plates.</p> Signup and view all the answers

Study Notes

Crust Overview

The crust is the Earth's outermost and thinnest layer.
Composed mainly of silicates with a lower magnesium oxide (MgO) content compared to the mantle.

Types of Crust

Oceanic Crust:
- Denser than continental crust.
- Primarily made of basaltic rocks rich in magnesium and iron.
Continental Crust:
- Less dense than oceanic crust.
- Composition is similar to granite, which is lighter.

Lithosphere

The crust, along with the upper mantle, forms the lithosphere.
The lithosphere is characterized as colder and brittle.
It is divided into tectonic plates, which move and interact with each other.

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Description

Explore the Earth's crust, its two main types—oceanic and continental—and their distinct characteristics. This quiz covers the composition, density, and the relationship between the crust and the lithosphere, which together form the tectonic plates. Test your knowledge on the fundamentals of Earth's outer layer.