Aquatic Ecosystem Quiz

What is the ratio of hydrogen to oxygen in water?

• 2:1

• 1:2

• 1:1

What percentage of Earth's water is fresh water?

• 1%

• 3%

• 70%

What happens to the density of water as it freezes?

• It increases

• It decreases

• It remains the same

What is the pH value of pure water?

• 7

• 6

• 8

What is the main source of oxygen in water?

• Atmospheric air

• Carbon dioxide

• Hydrogen

What is the normal salinity of ocean water?

• 35 grams per liter

• 10 grams per liter

• 50 grams per liter

What is the effect of temperature on water density?

• Density increases with temperature

• Density decreases with temperature

• Density remains constant

What is the role of hydrogen bonds in water?

• Increase boiling point

• Decrease boiling point

• No effect

What happens to the concentration of hydrogen ions when sodium bicarbonate is added to water?

• Increases

• Decreases

• Remains the same

What is the main process of the water cycle that leads to cloud formation?

• Evaporation

• Condensation

• Precipitation