Distribution, Location, and Composition of Water

2.2% of Earth’s freshwater is not available for man’s use. Why is this?

• it is polluted

• it is too salty

• it is frozen in glaciers and ice caps

Which of the following is a source of salt in the seas?

• acid rain

• particles falling from space

• underwater volcanic eruptions

What are the two PRIMARY dissolved ions in seawater?

• sodium and chloride

• calcium and chloride

• sodium and magnesium

Hydrothermal vents are formed as a result of water that seeps through earth’s crust near divergent boundaries (mid-ocean ridges) or subduction zones. When the water is heated by the magma in the mantle, it returns to the ocean through vents in the oceanic crust at the mid-ocean ridge. Which of the following will be true of the water returning through the vents?

• It will be much less dense because it does not contain minerals that help to form sea salt.

• It will be full of dissolved minerals that help to form sea salt.

• It will take away some of the dissolved minerals already in the ocean.

Tags

NGSS.MS-ESS3-1

Salinity is a measure of _________________________________.

• The amount of dissolved salts in the water.

• The amount of mass in a given amount of space (volume).

• The measure of how hot or how cold something is.

Which one of the descriptions below IS NOT a way salinity in the ocean can change?

• Salinity can change based on the amount of freshwater flowing into the ocean. Salinity will decrease.

• Salinity can change based on continental drift. When continents move, they cause a higher salinity.

• Salinity can change based on water movement. Water that doesn’t move as much has a higher salinity.

True of False:

As the depth of the ocean increases, the salinity increases and the temperature decreases.

• True

• False

True of False:

Out of all of the water on Earth, only .15% makes up surface water (rivers, lakes, ponds, etc).

• True

• False

Tags

NGSS.MS-ESS2-4

True of False:

Water conservation is unimportant because 71% of Earth is covered by water.

• True

• False

Tags

NGSS.MS-ESS2-4

NGSS.MS-ESS2-1

Which ocean is located at letter A?

• Atlantic Ocean

• Pacific Ocean

• Indian Ocean