Ch 9 Notes

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Ch 9 Notes. Mr. Russo Beaumont High School. Ch 9 Vocab Matrix (Pg 45). 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. - PowerPoint PPT Presentation

Text of Ch 9 Notes

Ch 9 Notes

Ch 9 NotesMr. RussoBeaumont High SchoolDivergent boundaryConvergent boundaryTransform fault boundaryOceanic RidgeRift ValleySeafloor Spreading

Subduction ZoneTrenchContinental Volcanic ArcVolcanic Island Arc PaleomagnetismHot Spot

Ch 9 Vocab Matrix (Pg 45)We will be able to describe the 4 pieces of evidence for the theory of continental drift.Objective: Ch 9.1 Pg 47Continental Drift The continents had once been joined to form a single supercontinentProposed by Alfred Wegner

Continental Drift

Pangaea The supercontinent (All Land)Continents broke apart and drifted to their current positionPangaea

Continental Puzzle Continents appear to form a puzzle that can be put togetherWhat evidence supports continental Drift?

Matching Fossils Several of the same types of fossils on different landmassesWhat evidence supports continental Drift?

Rock Types and Structures Mountain belts that end on one coastline seem to reappear on a landmass across the oceanWhat evidence supports continental Drift?

Ancient Climates Found evidence of glacial ice in countries that shouldnt have any glaciersWhat evidence supports continental Drift?

ObjectiveThe upper mantle and the crust act like a strong rigid layer. This layer is called the lithosphereCh 9.2What is the theory of plate tectonics?

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

Plate Plates are sections of the lithosphere7 Major platesLargest Pacific PlatePlates move 5cm/yrPlates

Convergent

Divergent

TransformWhat are the 3 types of plate boundaries?Divergent Boundary Occur when two plates move apartExample East African Rift ValleyDivergent Boundary

Example East African Rift Valley

Convergent boundary Occur when two plates move togetherConvergent Boundary

Transform Boundary When two plates grind past each otherExample San AndreasTransform Boundary

Every Plate contains all 3 types of boundaries

Oceanic Ridge Elevated area in the ocean, found along divergent boundariesCh 9.3Oceanic Ridge

Rift Valley Deep faults found along divergent boundariesRift Valley

Seafloor Spreading The process by which plate tectonics produce new lithosphereOldest part of the ocean floor is 180 million years old.Seafloor Spreading

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

Trench Surface Feature produced during a subduction zone. Trench

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

Volcanic Island Arc When 2 ocean plates collide, they produce volcanoes in the middle of an ocean, forming islandsVolcanic Island Arc

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

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

Convergent Boundaries Lithosphere is destroyedDivergent Boundaries Lithosphere is createdTransform Boundaries Lithosphere is neither created nor destroyed. NoticePaleomagnetism Study of changes in Earths magnetic fieldCh 9.4Paleomagnetism

Normal Polarity Same magnetism as present day magnetic fieldNormal Polarity

Reverse Polarity Rocks that show opposite magnetism then present dayReverse Polarity

The discovery of strips of rocks of alternating polarity across the ocean ridges. What evidence supports theory of plate tectonics?

The youngest crust (Seafloor) is at the ridge crest, the oldest crust is further awayHow old is the seafloor?

OldestYoungestHot Spot A rising plume of mantle that creates a volcanic area (Hawaii)

Hot spot supports idea that the plates move over Earths surfaceHot spot

Shaded Region Reverse Polarity

White Region Normal Polarity