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Shifting Earth Pieces

Riddle

Played 2 %Accuracy 98 Average time 04:23

About this activity

Identify a massive piece of the Earth's outer shell

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Shifting Earth Pieces
 

Shifting Earth PiecesOnline version

Identify a massive piece of the Earth's outer shell

by Rachael
1

I am a vast slab of rock, part of the crust and upper mantle, yet I am not fixed. I drift, collide, and grind with my neighbors, riding on a sea of hot, rising flow beneath. What am I?

Hints

Boundaries between me and my neighbors cause earthquakes and volcanoes.

Movements are powered by heat coming from beneath.

I am a large piece of the Earth's outer layer.

2

I am a process where one of the ocean floors slips under another, forming a deep trench and a chain of volcanic activity along the edge. What am I called?

Hints

Melting of the sinking plate in the mantle helps form volcanic activity along the boundary.

In this process, the sinking plate often creates a deep trench.

I occur at plate boundaries when an oceanic plate meets another plate.

3

I rise along the edge where one ocean floor slips beneath another, a curved line of fire marching across the sea. Volcanoes cradle my path, and I hug a trench as continents collide. What am I called?

Hints

The term for this curved chain of volcanic islands is a widely studied feature formed by subduction, ending with an “arc”.

The chain runs roughly parallel to an ocean trench.

I form at subduction zones where one tectonic plate sinks beneath another.

4

I am the process by which new ocean crust forms as tectonic plates part ways at a crack in the ocean floor. What am I?

Hints

It helps explain the age pattern of ocean floors and the symmetry of magnetic stripes across ridges.

Magma rises to fill gaps and pushes plates apart as it cools.

I occur mainly along mid-ocean ridges where oceanic plates separate.

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