Ocean Floor

A scientist is using sonar to map the ocean floor while traveling on the ocean surface in a ship. She observes that the first sound pulse returns from the ocean floor much more quickly than the second sound pulse. What can she conclude based on this information?

• The water under the ship is becoming deeper as the ship travels.

• The water under the ship is becoming less dense as the ship travels.

• The water under the ship is becoming more dense as the ship travels.

• The water under the ship is becoming more shallow as the ship travels.

Tags

NGSS.MS-PS4-2

The salinity of ocean water is not the same everywhere in the ocean. Which of the following is a cause of these differences in salinity?

• changes in the density of ocean water

• high evaporation rates at the ocean’s surface

• dumping of salt into ocean water near coastal cities

• extraction of ocean water for desalination by coastal nations

Many large bodies of water, such as the global ocean, have a layer called a thermocline. The graph below shows how temperature changes with depth in the ocean.

Between which two points on the graph is the thermocline?

•      points I and II

• points II and III

• points III and IV

• points IV and V

Tags

NGSS.MS-ESS2-6

Which pair of factors determines the density of ocean water?

• salinity and latitude

• latitude and longitude

• salinity and temperature

• longitude and temperature

______ is the amount of salt dissolved in the water.

• Temperature

• Density

• Salinity

• None

_____ refers how warm or cold is the water is

• Temperature

• Density

• Salinity

• None

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following statements about the extent of Earth’s global ocean is correct?

• It covers about half as much of Earth’s surface as land covers.

• It covers about the same amount of Earth’s surface as land covers.

• It covers more than twice as much of Earth’s surface as land covers.

• It covers more than three times as much of Earth’s surface as land covers

_____ refers to the mass of the water determined by salinity and temperature.

• Temperatur

• Density

• Salinity

• None

Scientist have been able to map the ocean floor using sound waves

• Satellites

• Sonar

• Deep Sea Drilling

• Underwater Vessels

Tags

NGSS.MS-PS4-2

Scientist use these objects orbiting in space to capture detailed images of the ocean floor.

• Satellites

• Sonar

• Deep Sea Drilling

• Underwater Vessels

Tags

NGSS.MS-ESS2-3