Earth's Water

Roughly what percent of Earth's surface is covered in water?

• 70%

• 50%

• 98%

• 25%

In what states does water exist on Earth?

• solid

• liquid

• gas

About what percent of Earth's water is saltwater?

• 3%

• 25%

• 70%

• 97%

The measure of water's salt content is...

• salinity

• density

• viscosity

• tonicity

Most of Earth's freshwater is locked in...

• glaciers and ice caps

• groundwater

• lakes and ponds

• the atmosphere

Water molecules are...

• polar

• nonpolar

Water is made of...

• 2 hydrogens and 1 oxygen

• 1 hydrogen and 2 oxygens

• 1 helium and 1 oxygen

• 2 heliums and 1 oxygen

Which side of the water molecule has a partially negative charge?

• hydrogen side

• oxygen side

Polar molecules have...

• balanced electrical charges

• imbalanced electrical charges

• balanced molecular masses

• imbalanced molecular masses

The bond between opposite partials charges of two water molecules is called a ___ bond.

• hydrogen

• oxygen

• ionic

• covalent