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Unit 9 - Page 264 - 272

Authored by J Martin

Geography

11th Grade

Used 1+ times

Unit 9 - Page 264 - 272
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20 questions

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1.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

What is a subduction zone?

A divergent boundary where plates move apart

A location where oceanic crust is forced beneath continental crust

A transform fault where plates slide past each other

A region where mantle plumes rise to the surface

Answer explanation

Answer: B. A location where oceanic crust is forced beneath continental crust.

  • Explanation: A subduction zone happens when one tectonic plate (usually oceanic) sinks under another plate (usually continental).

  • Example: The Pacific Plate being forced under the North American Plate along the west coast of the U.S., forming the Cascadia subduction zone.

2.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

What type of magma is typically found at subduction zones?

Basaltic magma

Andesitic magma

Rhyolitic magma

Komatiitic magma

Answer explanation

Answer: B. Andesitic magma.

  • Explanation: Subduction zones generate andesitic magma due to the melting of oceanic crust and sediments. This magma is thick and leads to explosive volcanic eruptions.

  • Example: Mount St. Helens in the U.S. or Mount Fuji in Japan.

3.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

The Earth's oceanic crust is primarily composed of:

Granite

Basalt

Sandstone

Limestone

Answer explanation

Answer: B. Basalt.

  • Explanation: Oceanic crust is made of basalt, a dense, dark volcanic rock, which forms when magma cools quickly underwater.

  • Example: The crust under the Atlantic Ocean.

4.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

What distinguishes continental crust from oceanic crust?

It is thinner and denser

It is thicker and less dense

It is primarily composed of basalt

It lies only at subduction zones

Answer explanation

Answer: B. It is thicker and less dense.

  • Explanation: Continental crust is thicker (up to 70 km) and lighter than oceanic crust, allowing it to float higher on the mantle.

  • Example: The Himalayas sit on thick continental crust.

5.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Mantle plumes are responsible for creating:

Subduction zones

Mid-ocean ridges

Hotspots

Transform faults

Answer explanation

Answer: C. Hotspots.

  • Explanation: Mantle plumes are columns of hot material from the Earth's mantle that rise and create hotspots, forming volcanic islands.

  • Example: Hawaii’s volcanic islands are formed over a hotspot.

6.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

A hotspot is characterized by:

Volcanic activity unrelated to plate boundaries

Earthquakes at transform boundaries

Subduction zones with deep-focus earthquakes

Divergent boundaries producing magma

Answer explanation

Answer: A. Volcanic activity unrelated to plate boundaries.

  • Explanation: Hotspots form due to mantle plumes, which are independent of tectonic plate edges.

  • Example: Yellowstone National Park is a hotspot volcano.

7.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Lava is formed when:

Magma is released onto the Earth's surface

The mantle melts completely

Subduction zones collide with transform faults

Mantle plumes solidify underground

Answer explanation

Answer: A. Magma is released onto the Earth's surface.

  • Explanation: Magma is molten rock inside the Earth. When it reaches the surface through volcanoes, it becomes lava.

  • Example: Lava flows from the Kilauea volcano in Hawaii.

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