Easy
Medium
Hard
Book facts
100

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

  • A) 50%
  • B) 71%
  • C) 85%
  • D) 90%

 

Answer: B) 71%

100

How much of the Earth's water is freshwater? 

  • A) 3%
  • B) 10%
  • C) 25%

Answer: A) 3%

100

What is the salinity of ocean water (percentage of salt in seawater)? 

  • A) 1.5%
  • B) 3.5%
  • C) 5.5%

Answer: B) 3.5%

100

Water needed to produce a teaspoon of coffee

Answer: 37 gallons
200

What is the chemical formula for water?

  • A) CO₂
  • B) H₂O
  • C) O₂H

 

Answer: B) H₂O

200

What is the largest freshwater lake by surface area? 

  • A) Lake Victoria
  • B) Lake Superior
  • C) Lake Baikal

Answer: B) Lake Superior

200

Which country has the most lakes in the world? 

  • A) Canada
  • B) Russia
  • C) United States

Answer: A) Canada

200

Deaths from dirty water every year

3.4 million

300

Which ocean is the largest on Earth? 

  • A) Atlantic Ocean
  • B) Indian Ocean
  • C) Arctic Ocean
  • D) Pacific Ocean

Answer: D) Pacific Ocean

300

What is the deepest ocean trench in the world? 

  • A) Mariana Trench
  • B) Puerto Rico Trench
  • C) Java Trench

Answer: A) Mariana Trench

300

How long can a person survive without water? 

  • A) 1-2 days
  • B) 3-5 days
  • C) 7-10 days

Answer: B) 3-5 days

300

Percentage of people without running water

50 %

400

What is the process called when water changes from a liquid to a gas?

  • A) Condensation
  • B) Evaporation
  • C) Precipitation

Answer: B) Evaporation

400

What is the term for water that is safe to drink? 

  • A) Distilled water
  • B) Potable water
  • C) Alkaline water

Answer: B) Potable water

400

What is the only substance on Earth that naturally exists in solid, liquid, and gas forms? 

  • A) Mercury
  • B) Water
  • C) Oxygen
  • D) Carbon Dioxide

Answer: B) Water

400

Daily water needed to prepare food for a family of four

6,800 gallons

500

What type of water do humans mostly drink? 

  • A) Saltwater
  • B) Freshwater
  • C) Mineral water

Answer: B) Freshwater

500

What is the main source of Earth's freshwater? 

  • A) Oceans
  • B) Ice caps and glaciers
  • C) Rivers
  • D) Underground lakes

Answer: B) Ice caps and glaciers

500

What is the largest river in the world by volume of water discharged? 

  • A) Nile River
  • B) Amazon River
  • C) Mississippi River

Answer: B) Amazon River

500
The amount of deaths by dirty water every week

42 thousand

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