SCIENCE FUN: The earth’s atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high, and the temperature of the atmosphere is low. It is composed of nitrogen (about 78%), oxygen (about 21%), argon (about 0.9%), carbon dioxide (0.04%) and other gases in trace amounts.
NATURE: Sand dunes occur in some deserts, inland and along some coasts, such as Virginia Beach’s. Some coastal areas have one or more sets of dunes, running parallel to the shoreline directly inland from the beach. In most cases, the dunes are important in protecting the land against potential ravages by storm waves from the sea.
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