Crossword Puzzle Ocean Floor Vocab (D)Online version Students will fill in crossword by Christi Scarbrough 1 Begins at shoreline and slopes gently down 2 Begins at the edge of the shelf and continues down to the flattest part of the ocean floor 3 The base of the continental slope, is made of large piles of sediment 4 Volcanic mountains that have broken the surface of the water. 5 The broad, flat part of the deep-ocean basin, covered with thick sediment. 6 Mountain chains that form when tectonic plates pull apart. Creates cracks in the ocean floor called RIFT ZONES 7 deep undersea valley at mid-ocean ridge 8 Individual mountains of volcanic material that have not broken the surface of the water. 9 deep canyons caused at subduction zones 6 7 9 5 2 4 1 8 3