Plate Tectonics Lesson 2: Seafloor Spreading

Geologist and Navy Admiral who mapped the seafloor in WWII discovering the Mid Atlantic Ridge and ocean trenches which led to his theory of 'seafloor spreading'

• Alfred Wegener

• Harry Hess

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Technology that Harry Hess used to map the ocean floor.

• SONAR

• LASER

• Echo Boom

• Drone

2 types of SONAR

• Passive and Active

• Conductor and Insulator

• Round and Square

• Light and Dark

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True or False : Sea-floor Spreading adds new material to the ocean floor?

• True
• False

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What are Mid-Ocean Ridges?

• A chain of underwater waterfalls 
• A chain of underwater volcanos
• A chain of underwater mountains
• A chain of underwater rocks

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The oceanic crust is pushed aside on both sides of the 

• Continent's edge
• Deep-ocean trench
• Mid-ocean ridge

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New crust is always formed at the...

• mid-ocean ridge
• deep-ocean trench
• asthenosphere

In Seafloor Spreading, molten material rises from the mantle and erupts or flows out

• along the edges of all the continents

• in the deep ocean trenches

• along mid-ocean ridges

• in the north and south poles

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Hot, less dense materials below the Earth's crust ______to the surface at the mid ocean ridges.

• rises

• falls

• disappears

• shrinks

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Process of heated liquids or gases becoming less dense and rising.

• Convection

• Conduction

• Radiation

• Emitting

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