Seawater

What is typical salinity of open ocean waters?

• 15 ppm

• 25 ppm

• 35 ppm

• 45 ppm

An abrupt change in water chemistry (the salinity) that causes a visible division in the water column is called a __________?

• Thermocline
• Pycnocline
• Halocline
• Salinocline

Tags

NGSS.HS-ESS2-5

What word describes when water is attracted to other substances?

• cohesion
• adhesion
• capillary action
• surface tension

Why does ice float?

• As water freezes, it expands and its density decreases.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Water molecules require a lot of energy to separate one from the others.  This gives water a high

• density
• polarity
• solvency
• specific heat

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The most abundant salt in the ocean is called

• salinity
• sodium chlorine
• sodium chloride
• chlorine

Tags

NGSS.MS-PS1-1

The part of the ocean that extends from the low-tide line to the edge of the continental shelf is the 

• Nertic Zone
• Open Ocean Zone
• Intertidal Zone
• Deep Zone

The two primary sources for salt being added to the ocean.

• Chemical Weathering and volcanic eruptions

• Earthquakes and landslides

• Fish overpopulation and precipitation

• Melting sea ice and condensation

Carbon dioxide and seawater combine to form

• calcium carbonate
• carbon monoxide
• carbonic acid 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Coral reefs are endangered by

• climate change

• overfishing

• pollution

• all of the above

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5