Exploring Ocean Composition and Topography

What is the most abundant salt found in ocean water?

• Potassium chloride

• Sodium chloride

• Magnesium sulfate

• Calcium carbonate

What is the term used to describe the amount of dissolved salts in water?

• Density

• Salinity

• Turbidity

• Acidity

Which gas is most abundant in ocean water?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

What is the name of the flat, deep part of the ocean floor?

• Continental shelf

• Abyssal plain

• Mid-ocean ridge

• Trench

Which feature is the steep slope between the continental shelf and the deep ocean floor?

• Continental slope

• Mid-ocean ridge

• Trench

• Seamount

What is the deepest part of the ocean called?

• Continental shelf

• Trench

• Abyssal plain

• Seamount

Which of the following is a raised area on the ocean floor formed by tectonic activity?

• Mid-ocean ridge

• Continental shelf

• Trench

• Abyssal plain

Tags

NGSS.MS-ESS2-3

What is the shallow, gently sloping area of the ocean floor next to a continent called?

• Continental shelf

• Trench

• Abyssal plain

• Mid-ocean ridge

Which of the following best describes the composition of ocean water?

• Pure water only

• Water with dissolved salts and gases

• Water and sand

• Water and oil

What is the main reason the ocean is salty?

• Rainfall

• Rivers carrying dissolved minerals

• Melting icebergs

• Underwater volcanoes