freshwater
Freshwater has much lower salinity than seawater. This topic is part of Water within Science & Nature. This page currently draws on 45 supporting questions, with answers and bonus facts available below.
freshwater trivia questions
Freshwater contains relatively little what?
Answer: Salt
Bonus fact: Freshwater has much lower salinity than seawater.
Most of Earth's unfrozen surface freshwater is stored in what?
Answer: Lakes
Bonus fact: Lakes hold far more surface freshwater than rivers.
What percentage of all Earth's water is roughly freshwater?
Answer: About 3%
Bonus fact: Most of Earth's water is salty ocean water.
In a freshwater aquarium, what beneficial bacteria process toxic ammonia into nitrite and then nitrate?
Answer: Nitrifying bacteria
Bonus fact: Biological filtration depends on nitrifying bacteria that help convert harmful nitrogen compounds.
An estuary is a place where freshwater from rivers mixes with what?
Answer: Seawater
Bonus fact: Estuaries are coastal zones where rivers meet the sea.
What is the largest freshwater lake by surface area?
Answer: Lake Superior
Bonus fact: Lake Superior is the largest freshwater lake by surface area.
Which lake contains the greatest volume of liquid freshwater on Earth?
Answer: Lake Baikal
Bonus fact: Lake Baikal is also the world's deepest lake.
Alewives can live in the ocean and migrate into freshwater to do what?
Answer: Spawn
Bonus fact: Anadromous alewives reproduce in rivers and lakes.
Which physiological ability lets bull sharks tolerate freshwater?
Answer: Osmoregulation
Bonus fact: Their kidneys and glands adjust salt and water balance.
Which major river is the largest source of freshwater to Chesapeake Bay?
Answer: Susquehanna River
Bonus fact: The Susquehanna provides a large share of the bay's freshwater inflow.
Lake Baikal contains roughly what fraction of the world's unfrozen surface freshwater?
Answer: About one-fifth
Bonus fact: Its enormous volume makes it the largest freshwater lake by volume.
An estuary is where freshwater mixes with what?
Answer: Saltwater
Bonus fact: Estuaries occur where rivers meet the sea.