Ocean Water Chemistry

The water column

Rainfall ________ salinity near the surface, while ____________ increases salinity in warm, dry areas

• Decreases, evaporation

• increases condensation

• decreases salinity

• increases heat

Tags

NGSS.MS-ESS2-4

Below the surface zone, salinity remains ______ ________ __________ ___ _____ ______

• Fairly constant throughout the water column

• stays the same

Density of seawater depends on ___________ and ________

• Temperature

• Salinity

What is the average salt content of our oceans?

• About 5%

• About 3.5%

• About 2.5%

• About 4.5%

How much salt is there in total in our seas?

• 40 million billion tons

• 60 million billion tons

• 50 million billion tons

• 70 million billion tons

How does most of the salt get into the ocean?

• Dissolved from sea floor rocks

• From the land via rivers

• Directly from rainwater

• From underwater volcanic vents

How much salt is deposited into our oceans every year from rivers?

• 6 billion tons

• 3 billion tons

• 5 billion tons

• 4 billion tons

Why is seawater near the poles less salty?

• Due to less evaporation

• Because of lower temperatures

• Because of freshwater springs

• Due to melting ice caps and heavy precipitation

What is the main reason our seas aren't full of calcium?

• Organisms use it to build their structures

• It evaporates with water

• It is not soluble in water

• It is converted to salt

What is the primary component of ocean water that affects its density?

• Salt

• Oxygen

• Carbon dioxide

• Nitrogen