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Defend Earth from alien invaders
Elevation or height above sea level
a group or chain of may islands in a sea(usually sharped like and arch)
An inlet from the sea or other body of water
Small island the shape of a ring or horseshoe formed by deposits of coral sea animals
The steep or sloping border of any sea
Low place in the surface of the land, usually with a body of water occupying the lowest part
Part of the sea or lake that cuts into the shoreline
a sluggish, marshy inlet or outlet of a lake, river or other body of water(gulf or Mexico Mississippi river)
The pebbly or sandy shore of the sea or lake washed by the waves
a steep, high bank beside a body of water
Wet ground not able to support much weight usually made up of decayed plants
a small creek or stream emptying into larger stream
Waves breaking into foam as they approach or dash against the shore
The very edge as the top of a bluff, cliff or precipice
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