hydrosphere and biosphere

How much of Earth's water is unavailable for humans to consume due to its high salinity? 

• 3%
• 23%
• 77%
• 97%

Why must humans clean water before using it? 

• Humans are unable to digest untreated river water
• River water is free of any contaminant or pollutants
• Untreated river water is brown and humans prefer clear water
• Clear water may contain contaminants that could harm humans
  

How does the amount of water circulating in the water cycle change?

• The amount of water remains constant
• The amount of water increases each time it rains
• he amount of water decreases and then increases each day
• The amount of water decreases every time evaporation occurs

All the water on, in , and surrounding the earth

• Atmosphere
• Hydrosphere
• Biosphere
• Lithosphere

Which two elements make up water?

• hydrogen and oxygen

• oxygen and carbon

• helium and oxygen

• hydrogen and neon

3% of the water on the Earth is

• saltwater

• freshwater

Water is the only substance on Earth that

• exists in the liquid state

• boils at very high temperatures

• freezes at very low temperatures

• commonly exists in all 3 states of matter

Water that fills cracks and spaces in underground soil and rock layers is

• saltwater

• rain water

• groundwater

• water vapor

Water that falls to Earth as rain, snow, sleet, or hail is called

• condensation

• evaporation

• precipitation

• transpiration

Most of the fresh water on Earth is located in

• ice

• rivers

• the air

• oceans