Ocean Ridges and Trenches

This included landforms like mountains, canyons, and deltas.

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This week, we'll be learning about underwater landforms.​

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​In the last couple of weeks, you all learned about continental landforms.

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​Underwater/Oceanic Landforms

Just like the name says, all of these landforms ​can be found underwater.

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What's great about many of them is that they have a continental landform that they look just like. So you'll be able to connect some of the likely unknown names to names that you do know.

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If this were a continental landform, we would call it a mountain range.

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But since it's underwater, we call it a mid-ocean ridge.

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​Mid-Ocean Ridge

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Multiple Choice

What do we call an underwater mountain range?

• A volcano

• A mid-ocean ridge

• A trench

If this were a continental landform, we would call it a canyon.

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But since it's an underwater landform, we call it a trench.​

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​Trench

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Multiple Choice

What do we call an underwater canyon?

• A mid-ocean ridge

• A seamount

• A trench

Rift zones are cracks in underwater mid-ocean ridges.

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Similar to a trench, but not as deep.

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​Rift Zone

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Multiple Choice

What is a small trench-like landform that is found in mid-ocean ridges?

• A valley

• An abyssal plain

• A rift zone

If this were a continental landform, we would call it a plain.

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But since it's an underwater landform, we call it an abyssal plain.​

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​Abyssal Plain

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Multiple Choice

What do we call an underwater plain?

• An abyssal plain

• A mid-ocean range

• We don't call it...it's busy and isn't taking calls right now

Seamounts can be pointed at the top.

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Or they can be flatter on the top. ​​

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​If seamounts were a continental landform, we would call them mountains or volcanoes.

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But since it's an underwater landform, we call them seamounts.

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They can be active or inactive volcanoes, but are usually inactive.

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Multiple Choice

What do we call an underwater mountain or volcano?

• A mid-ocean ridge

• An abyssal plain

• A seamount

Multiple Choice

Are seamounts pointed on top or rounded on top?

• Pointed

• Rounded

• Both

Large areas that are covered by ocean water​

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​Ocean Basin

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Multiple Choice

What do we call a large area covered by ocean water?

• An ocean basin

• An abyssal plain

• A trench

​Continental Shelf - Shallow area before dropping into deeper ocean

​Continental Slope - Dropping into the deep ocean

Continental Rise - Mud/sand sediment​ between slope and plain

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​Continental Shelf, Slope, and Rise

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Match

Match the following

• Most shallow area of the ocean

• Drops off into deeper ocean

• Mud/sand sediment between the Slope and Abyssal Plain

Continental Shelf

Continental Slope

Continental Rise

• Continental Shelf

• Continental Slope

• Continental Rise