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Chapter 16 The Marine Environment. The Shore The shore is the area of land between the low tide and area affected by storm waves.

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Presentation on theme: "Chapter 16 The Marine Environment. The Shore The shore is the area of land between the low tide and area affected by storm waves."— Presentation transcript:

1 Chapter 16 The Marine Environment

2 The Shore The shore is the area of land between the low tide and area affected by storm waves.

3 Erosional Shoreline Features Headlands are eroded by wave action to produce wave cut platforms

4 Longshore Currents Longshore currents move large amounts of sediments along the shore.

5 Depositional Shoreline Features Seashores are in a constant state of change. Sediments are moved and deposited by longshore currents

6 Human Impacts Humans modify the shoreline to try to control beach erosion

7 Use of groins to control erosion

8 Changes in Sea Level Climate 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 level – Melting glaciers adds to ocean volume Tectonic forces (uplift and sinking) can affect sea level in local areas

9 Seafloor Features Continental margin: where continent meets ocean

10 Continental Margin Continental shelf: average depth 130 meters; width can vary from a few to hundreds of kilometers Continental slope: the true edge of the continent; deep submarine canyons Continental rise: the base of the continental slope

11 Deep-Ocean Basins

12 Abyssal plains: flat parts of the ocean floor Deep-sea trenches: deepest parts of the ocean, created by ocean plates sliding under other plates Mid-ocean ridges: undersea mountain ranges, created by two plates being pushed apart Other features: seamounts, guyots, hydrothermal vents

13 Marine Sediments Terrigenous (deep-sea mud): originates on land Biogenous (oozes): forms from living organisms Hydrogenous: elements that precipitate directly from seawater. Ex: manganese nodules


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