Search Header Logo

Ocean Water Chemistry

Authored by Lisa Thompson

Science

8th Grade

NGSS covered

Used 2+ times

Ocean Water Chemistry
AI

AI Actions

Add similar questions

Adjust reading levels

Convert to real-world scenario

Translate activity

More...

    Content View

    Student View

15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the average salinity of the ocean?

3%

3.5%

4%

4.5%

Answer explanation

The correct average salinity of the ocean is 3.5%, making it the most accurate choice among the options provided.

2.

MULTIPLE SELECT QUESTION

1 min • 1 pt

Select two reasons as to why salinity can INCREASE

Evaporation because water is changing into water vapor leaving salt behind.

Freshwater is added to the ocean at the mouths of large rivers as they empty freshwater into oceans.

Freshwater is added by rain, snow, and melting ice.

Surface water freezes into ice, leaving salt behind.

Answer explanation

Salinity can increase due to evaporation, which leaves salt behind as water changes into vapor, and when surface water freezes into ice, leaving salt behind.

3.

MULTIPLE SELECT QUESTION

1 min • 1 pt

Select two reasons as to why salinity can decrease.

Evaporation because water is changing into water vapor leaving salt behind.

Freshwater is added to the ocean at the mouths of large rivers as they empty freshwater into oceans.

Freshwater is added by rain, snow, and melting ice.

Surface water freezes into ice, leaving salt behind.

Answer explanation

Salinity can decrease when freshwater is added to the ocean at the mouths of large rivers and through rain, snow, and melting ice, diluting the salt content in the water.

Tags

NGSS.MS-ESS2-4

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Where do oceans have the lowest salinity?

along the ocean floor

at the equator

on the north pole

where rivers flow into the ocean

Answer explanation

Oceans have the lowest salinity where rivers flow into the ocean, as freshwater dilutes the salt content.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The density of ocean water is influenced by what two factors?

Salinity and temperature

Water color and chlorophyll

Dissolved gases and dissolved solids

Dissolved carbon and trace elements

Answer explanation

The density of ocean water is influenced by salinity and temperature, as these factors affect the mass of water molecules and their arrangement.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Where would you find the lowest density seawater?

surface zone

deep zone

transition zone

abyssal zone

Answer explanation

The lowest density seawater is found in the surface zone due to factors like temperature, salinity, and exposure to sunlight.

7.

MULTIPLE SELECT QUESTION

1 min • 1 pt

Which processes decrease salinity?

freezing

melting sea ice

precipitation

surface runoff from land

evaporation

Answer explanation

Processes that decrease salinity include melting sea ice, precipitation, and surface run off from land.

Access all questions and much more by creating a free account

Create resources

Host any resource

Get auto-graded reports

Google

Continue with Google

Email

Continue with Email

Classlink

Continue with Classlink

Clever

Continue with Clever

or continue with

Microsoft

Microsoft

Apple

Apple

Others

Others

Already have an account?