Earth Science: Oceans

Which of the following contribute to the saltiness of the ocean?

• runoff from rivers and streams

• living organisms in the ocean

• precipitation

• factories dumping waste in the ocean

What do you call an underwater mountain?

• trench
• abyssal plain
• seamount
• volcanic island

The large, flat part of the ocean floor is called the _____________. 

• trench
• continental shelf
• continental slope
• abyssal plain

A volcanic mountain that rises above the surface of the water is called ____________

• trench

• island

• mid-ocean ridge

• seamount

If you are walking into the ocean you would be on the continental...

• shelf
• slope
• rise

the deepest part of the ocean

• trenches
• abyssal plain
• ocean basin
• rift

What is the difference between a volcanic island & a seamount?

• A volcanic island rises above the surface of the water & a seamount does not

• A seamount rises above the surface of the water & a volcanic island does not

• Both the seamount & volcanic island are underwater

• Both the seamount & the volcanic island rise above the water

the steep drop-off between the outer edge of the continental shelf and the deep ocean floor

• continental shelf

• guyot

• continental slope

• trench

The most abundant gases in the ocean are _____.

• nitrogen, sulfur oxide, oxygen

• carbon dioxide and oxygen

• nitrogen, oxygen, and carbon dioxide

• oxygen carbon dioxide and sulfur oxide

an underwater mountain chain where new ocean floor is formed

• mid-ocean ridge

• seamount

• guyot

• abyssal plain