Water is a simple ________ compound.

What is a simple chemical compound?

• a compound made up of simps

• a compound made up of two chemicals

• a compound made up of three or more chemicals

• a compound made up of basic chemicals only

Each molecule of water is made of 2 ________ and 1 ______ atoms.

• oxygen, hydrogen

• air, water

• hydrogen, oxygen

• hydration, helium

Earth is called the

• dirt planet

• earth planet

• water planet

• rock planet

Most of Earth's surface is covered in

• people

• earth

• dirt

• water

Most of Earth's water is

• fresh water

• salt water

• prime water

• bath water

Less than ___ of all water on Earth is freshwater.

• 30%

• 3%

• 10%

• 99%

Freshwater is water that contains ______ or __ dissolved salt

• heaps, little

• lots, plenty

• little, no

• little, yes

Where is most freshwater?

• rivers

• lakes

• groundwater

• ice caps and glaciers

What % of accessible surface water is water vapor?

• 8

• 52

• 1

• 12