Middle School Science 6 - Water Quiz

What percentage of the Earth's surface is covered with water?

• 50%

• 70%

• 90%

• 100%

Where can we find water existing in the air?

• As water vapor

• Rivers and lakes

• Oceans and seas

• Glaciers and ice caps

What percentage of the Earth's water is contained in the oceans and seas?

• 96.5%

• 80%

• 50%

• 30%

How much of the Earth's water is freshwater?

• 1%

• 2.5%

• 10%

• 5%

Which ocean accounts for the largest area covered by oceans?

• Arctic Ocean

• Indian Ocean

• Atlantic Ocean

• Pacific Ocean

What is the average salinity of seawater?

• 30 ppt

• 35 ppt

• 40 ppt

• 45 ppt

What is the chemical name for table salt found in ocean water?

• Calcium Chloride

• Magnesium Chloride

• Potassium Chloride

• Sodium Chloride

What is the most abundant and available source of fresh water?

• Atmosphere

• Rivers and streams

• Aquifers

• Glaciers

What percentage of the human body is water?

• 60%

• 66%

• 50%

• 70%