OAM Ch. 23: Seafloor Features

New seafloor is created here

• Deep ocean trench
• subduction zone
• mid-ocean ridge
• marine canyon

Deepest spot in the ocean

• Monterey Canyon
• Mariana Trench
• Puerto Rico Trench
• Mid-Atlantic Ridge

Large mountain ridges under the ocean that are formed when molten material from deep within the Earth flow up to the surface.

• Deep ocean trench
• abyssal plain
• guyot
• mid-ocean ridge

Guyot

• flat topped seamount
• volcanic island
• submarine canyon
• deep trench

seamount

• underwater atoll
• underwater volcano
• underwater island
• underwater hot spring

Abyssal plain

• long mountain range
• deep cut in the ocean floor
• large flat area deep on the ocean floor
• eroded island

What feature is marked by letter A?

• Continental slope
• Continental shelf
• Continental rise
• continent

What seafloor feature is marked with the letter G?

• Mid-ocean ridge
• submarine canyon
• abyssal plain
• deep ocean trench

What seafloor feature is marked with the letter D?

• Deep ocean trench
• Submarine Canyon
• Mid-ocean Ridge
• None of the above

The water at some areas along the mid-ocean ridges are very hot because ...

• earth's magnetic field creates heat
• The areas are closer to the core
• There is more sunshine
• There are hydrothermal vents along the mid-ocean ridges