A geologic event during which sea level rises relative to the land and the shoreline moves toward higher ground, resulting in flooding.
The two most densely populated European nations are England, with 407 people per square kilometer, and The Netherlands, with 397<span> people per square kilometer.</span>
The Aegean Sea occupies an area of sunken land called a graben.
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For an earthquake to generate a tsunami you need both water and vertical movement.
