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boundary between two air masses where a warm, lighter air mass is moving towards colder air
observing and gathering data about the Earth's surface from a distance above it
(also called voluntary population movement) the voluntary movement of people from one place to...
(also called a synoptic weather map) map showing a summary of the recorded weather at a given...
energy in the force of the incoming and outgoing tides that is harvested to drive turbines and...