Complete the words in the text. Тема: Adventure. Natural features.

Cliffs form where the land ends high above the
water. In Arctic regions they are made of ice.
1) O have salt water in them and cover
nearly 70% of the Earth. 2) S are also
salty, but they are smaller. Usually they have land
around most of their area.3) D are hills made of sand. The wind
usually forms them behind sandy 4) b
by the sea, or in 5) d like the Sahara.
In some places, water from 6) r travels
over rock. Over millions of years, it cuts the rock
away.This can result in a large 7) v , such
as the Hudson in the USA. Underground, moving
water also creates 8) c like those in
Jeita, Lebanon.
A 9) v is a hill or 10) m which
covers a gap in the surface of the Earth. Gas or
lava can come out of this gap at any time.

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