They are the driest places in the world. In the day ____ they are very ____ but at night they can be very cold. Only animals and plants that need very little water can live there. The biggest ____, the Sahara, is in Africa. Salty ____ cover more than half of the world. Strange fish and animals live deep in the ____. Different ____? look like beautiful ____. There are mountains on every ____. Their tops are usually covered in snow. High up the ____ is cold and ____, so plants can't grow there. The highest mountain, Everest, is in ____. They cover a small part of the world but they are home to thousands of ____ plants and animals. The weather is hot and ____ there all year round. The biggest ____ is in South America. There are only two ____ in grasslands: the wet season and the ____ season. There aren't many ____ but there's a lot of grass, so lots of different ____ live there. There are ____ in many parts of the world.

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