Tree and Life
Without plants such as trees there could be no life on Earth. Trees take in carbon dioxide from the air and give off oxygen by the process of photosynthesis, so maintaining the balance of the atmosphere. Tree roots stabilize the soil so it is not washed away by the rain, and their leaves give off vast amounts of water vapour, which affects the balance of the world's weather. Forests cover about 39 million sq km (15 million sq miles) of the planet's surface. Trees vary greatly in size, from towering redwoods to dwarf snow willows that are only a few centimeters high. They supply food for millions of creatures, and produce wood to make buildings, furniture.
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