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

• About 80%

• About 50%

• About 60%

• About 70%

Which ocean is the largest?

• Arctic Ocean

• Pacific Ocean

• Indian Ocean

• Atlantic Ocean

What is the source of a river?

• Underground springs

• Mountains or hills

• The ocean

• Lakes

How are lakes formed?

• By meteor impacts

• By ocean water getting trapped

• By rivers

• By rain or underground water finding its way into a basin

Why is the Dead Sea called 'Dead'?

• Because it's very deep

• Because it's in a desert

• Because it's very cold

• Because no living being can survive in it

What is the end of a river known as?

• the tail

• the arm

• the mouth

• the leg

What kind of water do rivers contain?

• fresh

• salty

• brackish

• red

Is the Dead Sea really a sea?