How are oceans formed? Continents and ocean basins exist on lithospheric plates that move relative to each Other. Between their margins, new land is always.

Slides:

Advertisements

Similar presentations

So what has caused the continents to drift ??

Advertisements

1.4 OUtline Plates converge or scrape past each other.

Plate Movement and Plate Boundaries Chapter 4, Section 3.

Plate Boundaries.

Types of plate boundaries

Types of Plate Boundaries

Plate Tectonics.

Types of Plate Boundaries

Plate tectonics. Continent-continent collisions.

What happens at tectonic plate boundaries?

The asthenosphere consists of solid rock that is flowing. But it’s not all flowing in the same direction.

Plate Tectonics. Earth’s Interior Earth is made of layers Crust Upper Mantle (asthenosphere ) Mantle Outer Core Inner Core Scientists discovered these.

Lesson 14: Plate Tectonics II Geological Oceanography.

Map Of The Plate Boundaries

Using Google Earth to See the World

Volcanoes Earth and Space Science. How many are there? About 60 of the ~550 known active volcanoes erupt each year There are many more volcanoes underwater.

How Landforms Are Created

Plate Boundaries. Destructive Plate Boundaries Also known as convergent boundaries or compressional boundaries. These cause violent volcanoes and earthquakes,

Theory of Plate Tectonics Theory that pieces of lithosphere move around on top of the asthenosphere.

PLATE TECTONICS.

Sea Floor Spreading & Plate Tectonics Ch.2 The Sea Floor.

Plate Tectonics. The Earth’s Crust is Made of Plates.

Theory of Plate Tectonics. How do we know the plates exist?  Earthquake and Volcano Zones  Ocean floor features (Trenches and Mid-Oceanic ridges)

Plate Tectonics

Tectonic Plate Boundaries

Theory of Plate Tectonics. Theory of Continental Drift The Theory of Plate Tectonics starts with another idea… Continental Drift. The Earth once had a.

Types of Plate Boundaries Divergent Plate Boundaries Convergent Plate Boundaries Transform Faults.

Plate Tectonic Booklet Convection Currents. Example: Mid-Atlantic Ridge Effects: 1. Creates a submarine mountain range 2. Volcanic activity in the form.

PLATE TECTONICS. Lithospheric plates Lithosphere is made up of 12 large plates and about 20 smaller ones Plates are solid and float on the asthenosphere.

Starter/Practice: Connection : Application/ Notes 1/7/15 Plate Boundaries Notes How do you think the continents formed? Plate Boundaries Notes.

Essential Question: How does the constant movement of lithospheric plates cause major geological events on the earth’s surface? Standard: S6E5e. Recognize.

What is the Theory of Plate Tectonics? – The theory of plate tectonics states that Earth’s lithosphere is broken into enormous slabs called plates. –

Plate Tectonics. The crust is broken into plates that float on the mantle. The crust is broken into plates that float on the mantle. Sometimes the plates.

Plate Tectonics Plate Boundaries and Interactions.

Plate Boundaries. Convergent Boundaries 2 plates move toward each other Destructive plate margins Old plate material is being recycled Oceanic crust.

Starter/Practice: Connection : Application/ Notes 1/6/16 Plate Boundaries Notes How do you think the continents formed? Plate Boundaries Notes.

Plate Boundaries. Divergent Plate Boundary Description of Plate Boundary & Motion at Boundary: ON LAND – two plates spread apart; crust separates and.

Plate Tectonics. Plate Boundaries Causes of Plate Tectonics.

 Plate Tectonics refers to the movements of plates (large segments of continents and ocean) around the Earth’s surface.  These land masses are seen.

 The lithosphere is broken up into what are called tectonic plates. In the case of Earth, there are currently eight major and many minor plates  Earthquakes,

Theory of Plate Tectonics. How do we know the plates exist?  Earthquake and Volcano Zones  Ocean floor features (Trenches and Mid-Oceanic ridges)

Plate Tectonics Earth Science Chapter 9. Continental Drift  scientific theory proposing the slow, steady movement of Earth’s continents  Alfred Wegener:

Chapter 9 Plate Boundaries.

Earth’s Structure by BrainpopGeological Changes—3:25.

Continental Drift.

Tectonic Plate Boundaries and Their Effects

Plate Tectonics. Theory of Plate Tectonics States that Earth’s crust & rigid upper mantle are broken into slabs called plates The plates move in different.

Plate Boundaries.

Continental Drift and Plate Tectonics (notes pt. 2)

Earth’s Structure.

3 Movements at plate boundaries

Plate Tectonics.

Plate boundaries & convection currents

Theory of Plate Tectonics

Plate Boundaries Convergent plate boundaries (destructive margins)

Plate Boundary Notes.

9-3 Theory of Plate Tectonics

Plate Tectonics.

Plate Tectonics II Geological Oceanography

Plate Tectonics.

Plate Tectonics The theory that the Earth’s lithosphere is divided into tectonic plates that move around on top of the asthenosphere.

Oreo plate tectonics.

Theory of Plate Tectonics

Plate Interactions How do tectonic plates interact with one another?

9.3 Actions at Plate Boundaries

Plate Tectonics.

Lesson 14: Plate Tectonics II Geological Oceanography

Plate Tectonics Part II: Plate Boundaries.

Plate Tectonics II Geological Oceanography

Presentation transcript:

How are oceans formed? Continents and ocean basins exist on lithospheric plates that move relative to each Other. Between their margins, new land is always built or destroyed…

How are oceans formed? New ocean basin is being made in areas such as the mid-Atlantic ridge… These are referred to as divergent boundaries… New crust is generated; plates pull away from each other… Rate of spreading of plates is about 2.5 cm / year. This would be enough for the Atlantic ocean to form over the last 100-200 million years…

How are oceans formed? Iceland stands over the Mid-Atlantic ridge and has been an ideal place for study of plate tectonics.

How are oceans formed? Krafla volcano in eastern Iceland.

How are oceans formed? The Atlantic ocean was formed by breakdown of Pangaea…

How are oceans formed? Formation of the young Atlantic, cont…. Can you think of another area where this may be happening today?

How are oceans formed?

Plate Tectonics As new land is made in diverging plate boundaries, old land is “destroyed” at convergent plate boundaries, creating trenches, mountain ranges, etc.

Plate Tectonics So what happens when two plates meet at convergent boundaries? Ex: Nazca Plate pushes into South American Plate and is subducted. South American Plate is lifted, creating the Andes mountains.

Plate Tectonics Continental convergence zones also create trenches that are thousands of miles long and 8-10 kilometers deep. Many of the earth’s active volcanoes are also found around these oceanic- continental convergence zones.

Plate Tectonics When oceanic plates meet, one plate will be subducted. Often, this process results in formation of trenches: e.g. Mariana Trench, where Pacific and Philippines plates meet, is almost 11,000 meters deep! These are also areas where one sees island arcs such as the Marianas or the Aleutian Islands…

Plate Tectonics When continental crusts meet, there is only Partial subduction… Since the continental Rocks are relatively light, the crusts tend To buckle and push upward…. Ex: the Himalayas

Plate Tectonics Sometimes, plates slide by each other (rather than meeting head on), creating transform boundaries… San Andreas Fault

Plate Tectonics General Review…

Plate Tectonics – Hot Spots A “hot spot” can develop over a fixed mantle plume. In these areas, magma rises to the surface, eventually creating volcanic islands… This phenomenon also creates island chains such as the Hawaiian Islands.

How are oceans formed? How deep?