CONTINENTAL CRUST vs. OCEANIC CRUST Solar Wind.

Slides:

Advertisements

Similar presentations

Chapter 19 Plate Tectonics.

Advertisements

Continents change position over time

WARM-UPS #1 Use your p to answer the questions. Use your p to answer the questions. 1. What type of boundary occurs where plates collide?

Objective 5 October 2012 Describe the theory of continental drift.

Continents change Position over Time

Our Ever-Changing Earth

Continental Drift, Sea Floor Spreading and Plate Tectonics

The Ocean EARTH: The only planet w/ Oceans (or liquid water) Covers 71% of earth’s surface “Divided” into 4 large basins –Pacific (largest, deepest) –Atlantic.

Plate Tectonics and the Ocean Floor.

“Ocean Floor Features” Titanic on Ocean Floor.

What evidence do we have that over time continents have moved?

© 2011 Pearson Education, Inc. CHAPTER 2 Plate Tectonics and the Ocean Floor.

The Theory of Sea Floor Spreading Page 99. Sea Floor Spreading Harry Hess (1960) as the ocean floor spreads apart, new crust material rises from the mantle.

The observation that the continents fit together like puzzle pieces, and may once have been connected, led Alfred Wegener to propose a theory in 1910 called.

Chapter 10: Plate Tectonics

Theory of Continental Drift

Evidence for Continental Drift

 All of the phenomena that we will discuss over the next month are all a result of plate tectonics.  Plate Tectonics is the idea that the Earth is broken.

Plate Tectonics.

Plate Tectonics And Continental Drift. Early Evidence for Continental Drift.

Chapter 4 Continental Margins and Basins. Continental Margins These are the areas of the edges of the continents that are under water – Passive margins.

Continental Margins Continental shelf: shallowest part of the margin

Continental Drift and Sea Floor Spreading

Chapter 7 Section 1: Continental Drift Section 2 : Sea Floor Spreading

9.1 Continental Drift. I. Evidence for Continental Drift A. Pangaea i. Alfred Wegener – proposed continental drift as a theory ii. Continental Drift –

Plate Tectonics.

Continental Drift Theory

Chapter 8 Review

Chapter 2 The Sea Floor. Geologic Processes Sculpt shorelines Determine water depth Control whether bottom is muddy, sandy, or rocky Create new islands.

Chapter 2 The Sea Floor. The Water Planet OCEANS Cover 71% of the globe Regulate earth’s climate and atmosphere.

The Sea Floor. Continental vs. oceanic crust What is Continental Drift? The idea that the plates are floating and moving around on a liquid mantle.

Forces behind change Plate tectonics. Focus Questions How does the movement of the earth’s plates cause land features? What evidence supports the theory.

Plate Tectonics and Continental Drift. Continental Drift Alfred Wegener believed that the continents were once connected. This large continent was called.

3 Bathymetry of the Ocean Floor Bathymetry= measuring ocean depths and charting the shape or topography of the ocean floor “Sounding” lines (started in.

Plate Tectonics. Plate Tectonics is a theory that describes the formation, movements, and interactions of Earth’s plates.

Chapter 23 The Ocean Floor 3 ways to study the ocean floor……. Echo sounding Sediment sampling Satellite observations.

Physical Science Question: How can magnetism of rocks provide evidence of continents moving?

Chapter Two The Sea Floor. Geography of the Ocean Basins Why is it important to study geography of the ocean basins in marine biology? Why is it important.

Ocean Topography.

CHAPTER TEN PLATE TECTONICS. Background Information  The Earth is made up of several layers that have different properties and compositions.  There.

List 1 fact about Earth. Agenda for Monday Nov 22 nd 1.Finish Movie 2.Layers of the Earth notes.

Continental Margins & Deep Ocean Basins

Development of the Theory of PLATE TECTONICS

Plate Tectonics. Theory of Continental Drift The theory that continents drifted across the ocean to get their current spots on the globe. First suggested.

PART 1: The Theory of Continental Drift is a hypothesis that states the continents once formed a large, single landmass called Pangaea.

Geology Module # 7 The History of Plate Tectonic Theory Pangaea was the name of the land mass that existed approximately 240 million years ago. Alfred.

Plate Tectonics.

Study Notes Standard 2 Objective 2

Plate Tectonics.

8th Grade Dynamic Earth (Mod E) U4L2: Plate Tectonics

Plate Tectonics.

The Ocean floor and Coast

Plate Tectonics plate tect BN.asf.

Land Unit: Plate Tectonics

Land Unit: Plate Tectonics

PART 1: The Theory of Continental Drift is a hypothesis that states the continents once formed a large, single landmass called Pangaea.

Distribution of oceans and continents

Ocean Features.

Land Unit: Plate Tectonics

The Ocean Floor Notes December 2, 2018.

Features of the Ocean Floor

Plate Tectonic Notes 2/7/19.

8th Grade Dynamic Earth (Mod E) U4L2: Plate Tectonics

Plate Tectonics.

Earth Science- The Earth’s Moving Plates

Ocean Features.

Continental Drift.

Unit 4: How do the oceans change? What are the parts of the oceans?

The Changing Earth.

Presentation transcript:

CONTINENTAL CRUST vs. OCEANIC CRUST

Solar Wind

Earth or Ocean

How many oceans?

Continental Drift Alfred Wegner 1912 German geophysicist Super continent:PangeaPanathalassa 2 sections:Laurasia Gondwanaland Problem with Wegner’s theory: Finally accepted in :1960

Why no one believed him? 1.Wegner said the continents could plow through the continental crust. 2.Said the continents moved because of the gravitational pull of sun and moon. 3.Said the spinning of the earth also caused continents to move.

Mid Ocean Ridge Post WW II b/c of sonar use to track submarines Cmdr. Harry Hess leaves sonar on full time Mtns. avg 1.5 miles high Responsible for creating …..

EVIDENCE the CD occurred Glacial Evidence: – 300 million year old Glacial remains found in India, Africa, Australia, S. America – Whole world covered with ice? These continents used to be located at the north and south poles

Fossil evidence

More evidence Palm tree fossils found in Arctic regions Coral fossils found in present day cold climates Maps of continent locations

Magnetic reversals Molten rock contains: MAGNETITE animate

Sea floor spreading

Age of the sea floor confirmation GLOMAR EXPLORER

Types of ocean sediments: 4 Lithogenous Hydrogenous Biogenous Cosmogenous

Ocean Sediment details

Project Nekton

HRE??

Continental vs. Oceanic

Divergent Boundaries Convergent Boaundaries Plate Movements

Transform Boundaries

Continental Margin Continental Shelf: Gentle angle Sm. Pt. of Oceans ½ mile – 450 mile wide VERY rich in sea life Continental Slope: Actual boundary of the continents Very steep angle Continental Rise: Where the sediment has accumulated Abyssal Plain: Deep sea floor Has: Hills, guyots volcanoes

Active vs. Passive margins Steep shelf, slope and there is no rise Lots of Earthquake and volcanic activity Ex. Western edge of S. American coast Wide Shelf, gentle slope, long rise, lots of sediment Geologically inactive b/c no plates are subducting Ex. East coast USA

mid ocean ridge and hydrothermal vents

BBC: hydrothermal vents BBC: underwater lake