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thick layers of undisturbed sediment cover continental margins
very litle volcanic or earthquake activity
crust plunging beneath continental crust- narrow continental margin - results in volcanoes and earthquakes
gently sloping submerged surface extending from shore line contains oil, natural gas, sand, gravel
down slope movements of dense, sediment-laden water
-sand and mud on the continental shelf
deep ocean trenches
a deep valley along the ocean floor through which oceanic crust slowly sinks towards the mantle
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