There is enough salt in the o _ _ _ _ to cover the Earth's surface.
OCEAN
The highest mountain p _ _ _ in the world is in Nepal.
PEAK
Many animals living on Earth today are e _ _ _ _ _ _ _ _ _, which means they are at risk of becoming extinct.
ENDANGERED
There are 23 d _ _ _ _ _ _ in the world.
DESERTS
Half of all land animals live in the j _ _ _ _ _.
JUNGLE
About 50% of an i _ _ _ _ _ _ can't be seen because it is underwater.
ICEBERG
The world's biggest explored c _ _ _ is about 100 km long.
CAVE
Despite the cold, Antarctica is home to animals such as p _ _ _ _ _ _ _ and seals.
PENGUINS
Antarctica is the c _ _ _ _ _ _ continent.
COLDEST
The natural home of a particular animal.
HABITAT
What is this called?
DEFORESTATION
