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BASIN OCEAN FLOOR. Objectives At the end of the lesson the students are expected to: identify the major features of the Ocean Basin Floor and the Oceanic.

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Presentation on theme: "BASIN OCEAN FLOOR. Objectives At the end of the lesson the students are expected to: identify the major features of the Ocean Basin Floor and the Oceanic."— Presentation transcript:

1 BASIN OCEAN FLOOR

2 Objectives At the end of the lesson the students are expected to: identify the major features of the Ocean Basin Floor and the Oceanic Ridge label the features of the Ocean Floor List and describe the three types of Seafloor Sediment Objectives At the end of the lesson the students are expected to: identify the major features of the Ocean Basin Floor and the Oceanic Ridge label the features of the Ocean Floor List and describe the three types of Seafloor Sediment

3 The OCEAN BASIN FLOOR lies between the continental margin and the oceanic ridge.

4 Ocean Basin Floor o Deep-ocean trenches o Abyssal plains o Seamounts

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6  DEEP-OCEAN TRENCHES are long, relatively narrow creases in the seafloor that form the deepest parts of the ocean  volcanic island arc- arc shaped row of active volcanoes  DEEP-OCEAN TRENCHES are long, relatively narrow creases in the seafloor that form the deepest parts of the ocean  volcanic island arc- arc shaped row of active volcanoes

7 Challenger Deep(Mariana Trench) - the deepest known part of the world ocean Challenger Deep(Mariana Trench) - the deepest known part of the world ocean

8 ABYSSAL PLAINS are deep, incredibly flat features. These regions are likely the most level places on Earth. ABYSSAL PLAINS are deep, incredibly flat features. These regions are likely the most level places on Earth.

9 SEAMOUNTS are isolated volcanic peaks which may rise hundreds of meters above the surrounding topography.

10 Some are formed as a result of hot spots while others may form near oceanic ridges Volcanic islands in the Atlantic 1. Azores 2. Ascension 3. Tristan da Cunha 4. St. Helena Some are formed as a result of hot spots while others may form near oceanic ridges Volcanic islands in the Atlantic 1. Azores 2. Ascension 3. Tristan da Cunha 4. St. Helena

11 GUYOTS or TABLEMOUNTS are submerged, flat-topped seamounts.

12 MID-OCEAN RIDGE Oceanic ridge or Mid-Ocean ridge Is topographically elevated feature that is found near the center of the most ocean basins. It is characterized by extensive faulting and numerous volcanic structures that have developed on the newly formed crust. Oceanic ridge or Mid-Ocean ridge Is topographically elevated feature that is found near the center of the most ocean basins. It is characterized by extensive faulting and numerous volcanic structures that have developed on the newly formed crust.

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14 Mid-Ocean Ridge

15 SEAFLOOR SEDIMENTS  TERRIGENOUS SEDIMENTS  BIOGENOUS SEDIMENTS  HYDROGENOUS SEDIMENTS  TERRIGENOUS SEDIMENTS  BIOGENOUS SEDIMENTS  HYDROGENOUS SEDIMENTS

16 TERRIGENOUS SEDIMENTS o consist primarily of mineral grains that were weathered from continental rocks o accumulates slowly ( ,000yrs to deposit 1cm abyssal clay layer o color may be red or brown o consist primarily of mineral grains that were weathered from continental rocks o accumulates slowly ( ,000yrs to deposit 1cm abyssal clay layer o color may be red or brown

17 BIOGENOUS SEDIMENTS Biological origin- primarily shells and skeletons of marine animals and algae.

18 Types of Biogenous sediments o Calcareous oozes - remains of foraminifera and coccolithophores -may form chalk o Siliceous oozes - remains of radiolarians and diatoms o Phosphate-rich materials -from bones, teeth and scales of fish o Calcareous oozes - remains of foraminifera and coccolithophores -may form chalk o Siliceous oozes - remains of radiolarians and diatoms o Phosphate-rich materials -from bones, teeth and scales of fish

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20 HYDROGENOUS SEDIMENTS Consist of minerals that crystallize directly from seawater through various chemical reactions maa

21 Thank You!!!!!!


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