A reef than surrounds a volcanic island is an : Atoll
Atoll usually takes shapes in a form of ring that surround the areas of volcanic island that consist of corals. It usually only exist in warm waters, so volcanic islands will provide perfect environment for the corals
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Nepal, containing mount Everest, has been shown to have the largest mountain.
In a solar eclipse the moon goes in front of the sun and then and only then can the sun's corona be seen without dmaging your eye sight. In a lunar eclipe the earth is in front of the moon and as the sun is shining twords the earth, the earth creates a shadow and the moon apears to be red. Lunar eclipses happen more frequently.
It took the Aztecs more than 100 years of looking until one day in the valley of Mexico. This left the Aztecs with only the swampy area around lake Texcoco to call home
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