The Ocean Floor

The ocean floor -

• is always a flat bed of sand

• has mountains, plains, and ridges like land surfaces

• is covered by the same amount of water everywhere

• covers less area than the land

Which best describes the part of the ocean called the continental shelf?

• A flat underwater valley

• A region of mountains in the deep ocean

• A shallow area of sediment near the shore

• A region with a higher water pressure

Which of these are the deepest parts of the ocean?

• continental shelves

• continental slopes

• ocean trenches

• abyssal plains

The diagram shows a model of the ocean floor. Which number identifies the continental slope?

• 1

• 2

• 3

• 4

The diagram shows a model of the ocean floor. Which number identifies the continental rise?

• 1

• 2

• 3

• 4

At which location are oceans the deepest?

• 1

• 2

• 3

• 4

Algae and other producers need lots of sunlight. Most ocean algae would be found in the water-

• on the abyssal plain

• in the oceanic trench

• above the continental shelf

• beside the continental slope

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

At which location are oceans the deepest?

• Mid-ocean ridge

• Abyssal plain

• Ocean trench

• Volcanic island

At which location is likely to have the greatest water pressure, the coldest temperatures, and the smallest number of living organisms?

• 1

• 2

• 3

• 4

The main difference between ocean water and lake water it hat ocean water contains-

• oxygen

• salt

• algae

• plants