What two elements make up water?

• Helium and oxygen
• Hydrogen and oxygen
• helium and carbon
• oxygen and carbon

Tags

NGSS.MS-PS1-1

Attractions between water molecules are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

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.

Which end of the water molecule has a slightly positive charge?

• the oxygen end
• the hydrogen end
• both ends are slightly positive
• neither end is positive

Which process does NOT lead to a decrease in the salinity of water?

• runoff from land
• precipitation
• sea ice melting
• evaporation

Which term refers to a rapid change of temperature with increasing depth of the ocean?

• pycnocline
• thermocline
• abyssalocline
• isothermal cline

In addition to salinity, what factor affects the density of seawater?

• depth
• latitude
• temperature
• salt content

What happens to pressure as you go deeper into the ocean? 

• increases
• decreases
• stays the same
• doubles

Which of the following is not a process that decreases the salinity of seawater?

• runoff from land
• icebergs melting
• precipitation
• evaporation

Tags

NGSS.MS-ESS2-4

The highest salinity would be found in which of the following areas?

• an area with high rates of precipitation
• an area with high rates of evaporation
• an area with plenty of runoff
• all of the above

Tags

NGSS.MS-ESS2-4