Unit 1 Quiz

The deep ocean has a constant temperature of around *

• 0°C

• 2°C

• 10°C

The waters around the Bahamas have very clear water (and also swimming pigs)! Which is true?

• the water has high levels of phytoplankton and bacteria

• the water has low levels of phytoplankton and bacteria

The thermocline is *

• an ocean layer where rapid change in temperature occurs

• an ocean layer where rapid change in salinity occurs

• an ocean layer where rapid change in density occurs

The water of the Amazon River has a *

• low turbidity

• high turbidity

A water molecule is held together by *

• 1 hydrogen bond

• 2 hydrogen bonds

• 1 covalent bond

• 2 covalent 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 of the following would INCREASE salinity in a location?

• runoff from land

• ice melting

• heavy rainfall

• evaporation

Water is the only substance that naturally exists in all three phases on Earth: gas, liquid, and solid.

• True

• False

Where do the highest salinities occur? Refer to the graph titled "Sea Surface Salinity (ppt)" and "Sea Surface Temps (C)" with the x-axis labeled "Latitude."

• around 25°S and 35°N

• at the equator

Which is the hydrogen bond?

• Bond A

• Bond B