Q 01/05

Which body of water, whose shores are the lowest dry land on Earth, lets bathers float with ease?

A) Great Salt Lake

B) Dead Sea

C) Sea of Galilee

D) Lake Assal

Answer · why

B) Dead Sea

The Dead Sea is almost ten times as salty as the ocean, which makes its water so dense that swimming feels like floating. Its surface lies about 440 m...

Q 02/05

Which sea, bounded by four Atlantic currents rather than by land, is the only one with no coastline?

A) Labrador Sea

B) Scotia Sea

C) Chukchi Sea

D) Sargasso Sea

Answer · why

D) Sargasso Sea

The Sargasso Sea is marked out by its mats of brown Sargassum seaweed and calm blue water. European eels hatch there, then travel all the way to Europ...

Q 03/05

Which sea, bordered by Iran, Kazakhstan and Azerbaijan, is often listed as the world's largest lake?

A) Caspian Sea

B) Ionian Sea

C) Laptev Sea

D) Celebes Sea

Answer · why

A) Caspian Sea

The Caspian Sea covers an area larger than Germany and holds roughly 40% of all the world's lake water. Its sturgeon produce the roe behind its famous...

Q 04/05

Which Central Asian sea mostly dried up after Soviet irrigation diverted the rivers that fed it?

A) White Sea

B) Kara Sea

C) Aral Sea

D) Sea of Okhotsk

Answer · why

C) Aral Sea

The Aral Sea was once among the world's largest lakes, but by 2007 it had shrunk to a tenth of its former size. Its eastern basin is now called the Ar...

Q 05/05

Which sea bordering Turkey and Ukraine has oxygen-free depths that preserve ancient shipwrecks?

A) Ionian Sea

B) Black Sea

C) Levantine Sea

D) Sea of Crete

Answer · why

B) Black Sea

The Black Sea is more than 90% oxygen-free in its depths, because its deep water never mixes with the surface. Byzantine ships have been found there i...