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Earth's Structure and Continental Margins

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Earth's Structure and Continental Margins

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Questions and Answers

What is the primary composition of the Earth's core?

Oceanic crust

Solid rock and pockets of magma

Mainly metals, such as iron and nickel (correct)

Tectonic plates

What is the approximate percentage of the Earth's volume that the mantle makes up?

90%

50%

84% (correct)

15%

What is the outermost layer of the Earth?

Lithosphere

Mantle

Crust (correct)

Core

What is the result of the movement of tectonic plates?

Tectonic and seismic activity Signup and view all the answers

What is the rate at which tectonic plates move over the surface of the Earth?

A few centimeters per year Signup and view all the answers

What is the main characteristic of the Ring of Fire?

High levels of volcanic activity due to subduction Signup and view all the answers

What is the result of erosion on passive continental margins?

Flat inland geography with low levels of tectonic pressure Signup and view all the answers

What is the difference between sea canyons and oceanic trenches?

Sea canyons are formed by erosion, while oceanic trenches are formed by subduction Signup and view all the answers

Which of the following continents is nearly completely bounded by passive continental margins?

Africa, Antarctica, and Australia Signup and view all the answers

What is an example of an emergent coast?

A coast resulting from tectonic activity pushing the crust up Signup and view all the answers

What is the primary difference between oceanic plates and continental plates?

Density Signup and view all the answers

What feature is typically associated with an active continental margin?

Rising mountain ranges Signup and view all the answers

What process is responsible for the oceanic crust being melted and recycled?

Subduction Signup and view all the answers

What is the result of the process of subduction at an active continental margin?

Creation of a deep ocean trench Signup and view all the answers

What is an example of an area with an active continental margin?

West coast of North America Signup and view all the answers