8 Changes in Sea LevelClimate change caused by global warming is causing sea levels to rise:Thermal expansion: global temperature increases, causing seawater to heat up and expand, leads to rising sea levelMelting glaciers adds to ocean volumeTectonic forces (uplift and sinking) can affect sea level in local areas
9 Seafloor FeaturesContinental margin: where continent meets ocean
10 Continental MarginContinental shelf: average depth 130 meters; width can vary from a few to hundreds of kilometersContinental slope: the true edge of the continent; deep submarine canyonsContinental rise: the base of the continental slope
12 Deep-Ocean Basins Abyssal plains: flat parts of the ocean floor Deep-sea trenches: deepest parts of the ocean, created by ocean plates sliding under other platesMid-ocean ridges: undersea mountain ranges, created by two plates being pushed apartOther features: seamounts, guyots, hydrothermal vents
13 Marine Sediments Terrigenous (deep-sea mud): originates on land Biogenous (oozes): forms from living organismsHydrogenous: elements that precipitate directly from seawater. Ex: manganese nodules
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