Тексты на английском
<<  Basics of School Finance Уганда по географии  >>
The Structure of the Earth and Plate Tectonics
The Structure of the Earth and Plate Tectonics
Structure of the Earth
Structure of the Earth
The Crust
The Crust
How do we know what the Earth is made of
How do we know what the Earth is made of
What is Plate Tectonics
What is Plate Tectonics
If you look at a map of the world, you may notice that some of the
If you look at a map of the world, you may notice that some of the
Plate Tectonics
Plate Tectonics
World Plates
World Plates
What are tectonic plates made of
What are tectonic plates made of
What lies beneath the tectonic plates
What lies beneath the tectonic plates
Plate Movement
Plate Movement
Practical Exercise 1
Practical Exercise 1
What happens at tectonic plate boundaries
What happens at tectonic plate boundaries
Three types of plate boundary
Three types of plate boundary
Divergent Boundaries
Divergent Boundaries
Age of Oceanic Crust
Age of Oceanic Crust
Iceland: An example of continental rifting
Iceland: An example of continental rifting
Convergent Boundaries
Convergent Boundaries
Continent-Continent Collision
Continent-Continent Collision
Himalayas
Himalayas
Continent-Oceanic Crust Collision
Continent-Oceanic Crust Collision
Subduction
Subduction
Ocean-Ocean Plate Collision
Ocean-Ocean Plate Collision
The Structure of the Earth and Plate Tectonics
The Structure of the Earth and Plate Tectonics
Transform Boundaries
Transform Boundaries
The Structure of the Earth and Plate Tectonics
The Structure of the Earth and Plate Tectonics
Practical Exercise 2
Practical Exercise 2
Volcanoes and Plate Tectonics…
Volcanoes and Plate Tectonics…
Pacific Ring of Fire
Pacific Ring of Fire
Volcanoes are formed by:
Volcanoes are formed by:
Pacific Ring of Fire
Pacific Ring of Fire
What are Hotspot Volcanoes
What are Hotspot Volcanoes
The tectonic plate moves over a fixed hotspot forming a chain of
The tectonic plate moves over a fixed hotspot forming a chain of
Earthquakes and Plate Tectonics…
Earthquakes and Plate Tectonics…
As with volcanoes, earthquakes are not randomly distributed over the
As with volcanoes, earthquakes are not randomly distributed over the
Where do earthquakes form
Where do earthquakes form
Plate Tectonics Summary
Plate Tectonics Summary

Презентация: «The Structure of the Earth and Plate Tectonics». Автор: Simon Powell. Файл: «The Structure of the Earth and Plate Tectonics.ppt». Размер zip-архива: 7682 КБ.

The Structure of the Earth and Plate Tectonics

содержание презентации «The Structure of the Earth and Plate Tectonics.ppt»
СлайдТекст
1 The Structure of the Earth and Plate Tectonics

The Structure of the Earth and Plate Tectonics

2 Structure of the Earth

Structure of the Earth

The Earth is made up of 3 main layers: Core Mantle Crust

Mantle

Outer core

Inner core

Crust

3 The Crust

The Crust

Continental Crust thick (10-70km) - buoyant (less dense than oceanic crust) - mostly old

Oceanic Crust - thin (~7 km) - dense (sinks under continental crust) - young

This is where we live! The Earth’s crust is made of:

4 How do we know what the Earth is made of

How do we know what the Earth is made of

Geophysical surveys: seismic, gravity, magnetics, electrical, geodesy Acquisition: land, air, sea and satellite Geological surveys: fieldwork, boreholes, mines

5 What is Plate Tectonics

What is Plate Tectonics

6 If you look at a map of the world, you may notice that some of the

If you look at a map of the world, you may notice that some of the

continents could fit together like pieces of a puzzle.

7 Plate Tectonics

Plate Tectonics

The Earth’s crust is divided into 12 major plates which are moved in various directions. This plate motion causes them to collide, pull apart, or scrape against each other. Each type of interaction causes a characteristic set of Earth structures or “tectonic” features. The word, tectonic, refers to the deformation of the crust as a consequence of plate interaction.

8 World Plates

World Plates

9 What are tectonic plates made of

What are tectonic plates made of

Plates are made of rigid lithosphere.

The lithosphere is made up of the crust and the upper part of the mantle.

10 What lies beneath the tectonic plates

What lies beneath the tectonic plates

Below the lithosphere (which makes up the tectonic plates) is the asthenosphere.

11 Plate Movement

Plate Movement

“Plates” of lithosphere are moved around by the underlying hot mantle convection cells

12 Practical Exercise 1

Practical Exercise 1

Supercontinents!

13 What happens at tectonic plate boundaries

What happens at tectonic plate boundaries

14 Three types of plate boundary

Three types of plate boundary

Divergent Convergent Transform

15 Divergent Boundaries

Divergent Boundaries

Spreading ridges As plates move apart new material is erupted to fill the gap

16 Age of Oceanic Crust

Age of Oceanic Crust

Courtesy of www.ngdc.noaa.gov

17 Iceland: An example of continental rifting

Iceland: An example of continental rifting

Iceland has a divergent plate boundary running through its middle

18 Convergent Boundaries

Convergent Boundaries

There are three styles of convergent plate boundaries Continent-continent collision Continent-oceanic crust collision Ocean-ocean collision

19 Continent-Continent Collision

Continent-Continent Collision

Forms mountains, e.g. European Alps, Himalayas

20 Himalayas

Himalayas

21 Continent-Oceanic Crust Collision

Continent-Oceanic Crust Collision

Called SUBDUCTION

22 Subduction

Subduction

Oceanic lithosphere subducts underneath the continental lithosphere Oceanic lithosphere heats and dehydrates as it subsides The melt rises forming volcanism E.g. The Andes

23 Ocean-Ocean Plate Collision

Ocean-Ocean Plate Collision

When two oceanic plates collide, one runs over the other which causes it to sink into the mantle forming a subduction zone. The subducting plate is bent downward to form a very deep depression in the ocean floor called a trench. The worlds deepest parts of the ocean are found along trenches. E.g. The Mariana Trench is 11 km deep!

24 The Structure of the Earth and Plate Tectonics
25 Transform Boundaries

Transform Boundaries

Where plates slide past each other

Above: View of the San Andreas transform fault

26 The Structure of the Earth and Plate Tectonics
27 Practical Exercise 2

Practical Exercise 2

Where will the UK be in: 1,000 years? 1,000,000 years? 1,000,000,000 years?

28 Volcanoes and Plate Tectonics…

Volcanoes and Plate Tectonics…

…what’s the connection?

29 Pacific Ring of Fire

Pacific Ring of Fire

Volcanism is mostly focused at plate margins

30 Volcanoes are formed by:

Volcanoes are formed by:

- Subduction - Rifting - Hotspots

31 Pacific Ring of Fire

Pacific Ring of Fire

Hotspot volcanoes

32 What are Hotspot Volcanoes

What are Hotspot Volcanoes

Hot mantle plumes breaching the surface in the middle of a tectonic plate

The Hawaiian island chain are examples of hotspot volcanoes.

Photo: Tom Pfeiffer / www.volcanodiscovery.com

33 The tectonic plate moves over a fixed hotspot forming a chain of

The tectonic plate moves over a fixed hotspot forming a chain of

volcanoes.

The volcanoes get younger from one end to the other.

34 Earthquakes and Plate Tectonics…

Earthquakes and Plate Tectonics…

…what’s the connection?

35 As with volcanoes, earthquakes are not randomly distributed over the

As with volcanoes, earthquakes are not randomly distributed over the

globe At the boundaries between plates, friction causes them to stick together. When built up energy causes them to break, earthquakes occur.

Figure showing the distribution of earthquakes around the globe

36 Where do earthquakes form

Where do earthquakes form

Figure showing the tectonic setting of earthquakes

37 Plate Tectonics Summary

Plate Tectonics Summary

The Earth is made up of 3 main layers (core, mantle, crust) On the surface of the Earth are tectonic plates that slowly move around the globe Plates are made of crust and upper mantle (lithosphere) There are 2 types of plate There are 3 types of plate boundaries Volcanoes and Earthquakes are closely linked to the margins of the tectonic plates

«The Structure of the Earth and Plate Tectonics»
http://900igr.net/prezentacija/anglijskij-jazyk/the-structure-of-the-earth-and-plate-tectonics-199711.html
cсылка на страницу
Урок

Английский язык

29 тем
Слайды