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continental rise stretches from lower portion of continental slope to deepest part of ocean continental shelf where the ocean begins, covers 5% of earth's surface, extends in gtentle downward slope from edge of continents into ocean continental edge point at which the shelf surrounding each continent begins to angle sharply downward toward ocean depts continental slope clifflike drop beyond continental edge seamounts free-standing mountaints formed by volcanoes abyssal plain ocean bottom; covers 46% of Earth's surface mid-ocean ridge colossal chain of underwater mountains, longest mountain range in workd (36,000 miles) passing thru Atlantic, Indian, Pacific Oceans trench deep, narrow opening where ocean floor goes dowm rift valley deep valley (like a mountain valley) between hills in the ocean volcanic island volcano surrounded by water continent large land mass shoreline dry land which meets at the edge of ocean shore guyot flat topped seamount