Sea-Floor Spreading & Plate Tectonics

The ​ (a)   is the solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly, powered by ​ (b)   which allows ​ (c)   to move on top.

• Asthenosphere
• Convection
• tectonic plates

Tags

NGSS.MS-ESS2-1

What is the boundary where two tectonic plates are colliding?

The formation of new areas of oceanic crust, which occurs through the upwelling of magma at the Mid-Ocean Ridge.

• Continental Drift

• Sea Floor Spreading

• Floatation Theory

• Pangea

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

What is the Boundary called when two tectonic plates are moving away from each other?

• Convergent Boundary

• Divergent Boundary

• Transform Boundary

• Repulsive Boundary

Tags

NGSS.MS-ESS2-3

What is the long, undersea mountain chain that has a steep, narrow valley at its center, that forms as magma rises from the asthenosphere, and creates new oceanic seafloor as tectonic plates move apart?

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Match the following

• liquid rock produced under the Earth's surface

• Paleomagnetism

• the study of magnetic minerals in rock

• Magma

• long, narrow, steep depression that forms on the sea floor as a result of subduction

• Sea-Floor Spreading

• process by which new ocean floor forms as magma rises and solidifies at the Mid-Ocean Ridge

• Trench

• theory of how lithospheric plates move and change shape

• Plate Tectonics

Tags

NGSS.MS-ESS2-3

What is the name for a chain of volcanic islands that run parallel to a deep ocean trench or coastline as a result of a subduction zone?

• Hawaii

• Hot Spot

• Epicenter

• Volcanic Island Arc

What is the boundary called where lithospheric plates slide past each other and where the crust is neither destroyed or formed?

Tags

NGSS.MS-ESS2-3

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Tags

NGSS.MS-ESS2-3