The Earth is the only planet which has water on its surface making it suitable for ____ . Over ____ of Earths ____ is covered with ____ Central America, bordering the Pacific Ocean is one of the most active volcano belts of the world. Over ____ -thirds of the active volcanoes are found around the ____ Ocean No one knows exactly when the Earth was formed. ____ believe that the Earth was formed 4.____ billion years ago. The ____ is a blanket of gases which extends around the Earth. It is made up of ____ Nitrogen, ____ Oxygen and ____ of other smaller gases. The ____ is the highest level of the atmosphere, which means the gas is very sparse. The Himalayas are the highest and one of the youngest mountain ranges in the world. Their origin can be traced until the Jurassic Era, which is about ____ ____ years ago.

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