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Evolution of the Earth: The Earth's Chemistry

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Evolution of the Earth: The Earth's Chemistry

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Questions and Answers

What is the composition of the oceanic crust mainly made of?

Granite with an enrichment of Si, Na, and K

Aluminosilicates (feldspar)

Basalt with an enrichment of Ca, Mg, and Fe (correct)

Ultramafic with an enrichment of Mg

How thick is the oceanic crust on average?

~1 Km to 3 Km

~20 Km to 40 Km

~4 Km to 10 Km (correct)

~50 Km to 70 Km

What is the dominant mineral in the continental crust?

Basalt

Ultramafic minerals

Granite

Aluminosilicates (feldspar) (correct)

Which part of the Earth's structure contains a core mainly composed of iron and nickel?

Core (B) Signup and view all the answers

What percentage of the Earth's mass does the outer core contain?

30.8% (C) Signup and view all the answers

The inner core of the Earth remains solid due to:

High pressure (C) Signup and view all the answers

What are the four main chemical elements that make up the bulk of the Earth?

Iron, Oxygen, Magnesium, Silicon (A) Signup and view all the answers

Which layer of the Earth is denser than the crust layer and 'plastic', allowing it to flow?

Mantle (C) Signup and view all the answers

What is the average thickness of the continental crust?

40 km (A) Signup and view all the answers

Which layer of the Earth is a liquid iron/nickel mixture?

Outer Core (D) Signup and view all the answers

What is the term used to describe the boundary between the Crust and Upper Mantle where there is a change in rock type?

Mohorovicic Discontinuity (A) Signup and view all the answers

Which mineral is almost entirely composed of the outermost layer of the planet?

Silicate minerals (B) Signup and view all the answers