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Questions and Answers
What primarily composes the oceanic crust?
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?
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?
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?
How does the density of oceanic crust compare to continental crust?
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What characteristic of the lithosphere influences tectonic plate movement?
What characteristic of the lithosphere influences tectonic plate movement?
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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
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Oceanic Crust:
- Denser than continental crust.
- Primarily made of basaltic rocks rich in magnesium and iron.
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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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