Q 01/05

Which famous Scottish body of water holds more fresh water than every lake in England and Wales put together?

A) Loch Lomond

B) Loch Ness

C) Loch Morar

D) Loch Awe

Answer · why

B) Loch Ness

Loch Ness is only Scotland's second-largest loch by surface area, but its great depth makes it the biggest body of fresh water by volume in the Britis...

Q 02/05

Fresh water makes up under 3% of Earth's water, and most of that small share is stored where?

A) Glaciers and ice caps

B) Underground aquifers

C) Lakes and reservoirs

D) Clouds and water vapour

Answer · why

A) Glaciers and ice caps

Glaciers and ice caps lock up roughly two-thirds of the planet's fresh water, and most of the rest lies underground. Liquid water at the surface is on...

Q 03/05

For straining sediment and pollutants out of passing water, wetlands are often nicknamed nature's what?

A) Lungs

B) Arteries

C) Kidneys

D) Liver

Answer · why

C) Kidneys

Kidneys is the nickname because wetland plants and soils trap sediment and soak up excess nutrients before the water moves on. Some towns even build a...

Q 04/05

Which ocean predator swims so far up rivers that it has turned up in the Mississippi as far inland as Illinois?

A) Tiger shark

B) Lemon shark

C) Nurse shark

D) Bull shark

Answer · why

D) Bull shark

Bull shark bodies can adjust to both salt and fresh water, a trick most of their relatives lack. The species is so at home in one Central American lak...

Q 05/05

South America's boto, the largest of the river dolphins, is famous for slowly turning which colour as it matures?

A) Pink

B) Blue

C) Gold

D) Black

Answer · why

A) Pink

Pink skin appears in adults as repeated scrapes wear away the grey surface, and males, which fight more, end up the brightest. Calves are born dark gr...