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Mr. Russo Beaumont High School  Divergent boundary  Convergent boundary  Transform fault boundary  Oceanic Ridge  Rift Valley  Seafloor Spreading.

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Presentation on theme: "Mr. Russo Beaumont High School  Divergent boundary  Convergent boundary  Transform fault boundary  Oceanic Ridge  Rift Valley  Seafloor Spreading."— Presentation transcript:

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2 Mr. Russo Beaumont High School

3  Divergent boundary  Convergent boundary  Transform fault boundary  Oceanic Ridge  Rift Valley  Seafloor Spreading  Subduction Zone  Trench  Continental Volcanic Arc  Volcanic Island Arc  Paleomagnetism  Hot Spot

4  We will be able to describe the 4 pieces of evidence for the theory of continental drift.

5  Continental Drift – The continents had once been joined to form a single supercontinent ◦ Proposed by Alfred Wegner

6  Pangaea – The supercontinent (All Land) ◦ Continents broke apart and drifted to their current position

7  Continental Puzzle – Continents appear to form a puzzle that can be put together

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9  Matching Fossils – Several of the same types of fossils on different landmasses

10  Rock Types and Structures – Mountain belts that end on one coastline seem to reappear on a landmass across the ocean

11  Ancient Climates – Found evidence of glacial ice in countries that shouldn’t have any glaciers

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14  The upper mantle and the crust act like a strong rigid layer. ◦ This layer is called the lithosphere

15  The lithosphere lies on top of the weaker mantle called the ASTHENOSPHERE

16  Plate – Plates are sections of the lithosphere ◦ 7 Major plates ◦ Largest – Pacific Plate ◦ Plates move 5cm/yr

17  Convergent  Divergent  Transform

18  Divergent Boundary – Occur when two plates move apart  Example – East African Rift Valley

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20  Convergent boundary – Occur when two plates move together

21  Transform Boundary – When two plates grind past each other ◦ Example – San Andreas

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23  Oceanic Ridge – Elevated area in the ocean, found along divergent boundaries

24  Rift Valley – Deep faults found along divergent boundaries

25  Seafloor Spreading – The process by which plate tectonics produce new lithosphere  Oldest part of the ocean floor is 180 million years old.

26  Subduction Zone – When one plate is forced down beneath another plate. (Convergent Boundary)

27  Trench – Surface Feature produced during a subduction zone.

28  Continental Volcanic Arc – When a continental and ocean plate collide, they produce volcanoes on the land.

29  Volcanic Island Arc – When 2 ocean plates collide, they produce volcanoes in the middle of an ocean, forming islands

30  Mountains are formed when two continent plates collide.  Example – Himalayas in South Asia

31  Transform Fault – Earthquakes – At Transform faults, plates grind past without destroying the lithosphere and produce earthquakes.  Example – San Andreas Fault, CA

32  Convergent Boundaries – Lithosphere is destroyed  Divergent Boundaries – Lithosphere is created  Transform Boundaries– Lithosphere is neither created nor destroyed.

33  Paleomagnetism – Study of changes in Earth’s magnetic field

34  Normal Polarity – Same magnetism as present day magnetic field

35  Reverse Polarity – Rocks that show opposite magnetism then present day

36  The discovery of strips of rocks of alternating polarity across the ocean ridges.

37  The youngest crust (Seafloor) is at the ridge crest, the oldest crust is further away Oldest Youngest

38  Hot Spot – A rising plume of mantle that creates a volcanic area (Hawaii)  Hot spot supports idea that the plates move over Earth’s surface

39  Shaded Region – Reverse Polarity  White Region – Normal Polarity


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