chapter 9 (features of the ocean)

A deep canyon in the ocean floor is called a(n) _____.

• trench
• seamount
• abyssal plain
• continental shelf

A nearly flat region of the ocean floor, covered with thick layers of sediment, is called a(n) _____.

• abyssal plain
• seamount
• continental slope
• mid-ocean ridge

Which letter identifies the continental shelf? 

• A
• B
• E
• G

What causes the formation of feature C in the diagram? 

• Two plates coming together and one plate sinking under the other.
• Two plates separating and magma flowing into the ocean.
• The occurrence of an earthquake, which often causes a tsunami.
• Extreme volcanic activity and movement of lava and magma.

Which feature is part of the underwater mountain range that winds through Earth’s oceans? 

• D
• F
• E
• G

 Letter F represents a(n) _____. 

• seamount
• mid-ocean ridge
• volcanic island
• abyssal plain

Which feature of the ocean floor is letter E? 

• volcanic island
• seamount
• continental slope
• continental shelf

Most of the world’s major fisheries are found near _____.

• coastlines
• seamounts
• hydrothermal vents
• abyssal plains

 What is a living ocean resource often used as a thickener in shampoo, cosmetics, and ice cream?

• algae
• fish scales
• tuna
•  oil

The richest deposits of oil and natural gas are often located _____.

• on the continental shelves
• on the abyssal plains
• in the intertidal zone
• inside deep-sea trenches