Презентация на тему KS4 Earth's Structure

Презентация на тему Презентация на тему KS4 Earth's Structure, предмет презентации: География. Этот материал содержит 23 слайдов. Красочные слайды и илюстрации помогут Вам заинтересовать свою аудиторию. Для просмотра воспользуйтесь проигрывателем, если материал оказался полезным для Вас - поделитесь им с друзьями с помощью социальных кнопок и добавьте наш сайт презентаций ThePresentation.ru в закладки!

Слайды и текст этой презентации

Слайд 1
KS4 Earth’s Structure
Текст слайда:

KS4 Earth’s Structure


Слайд 2
Structure of the Earththe crustmantleouter coreinner core
Текст слайда:

Structure of the Earth

the crust

mantle

outer core

inner core


Слайд 3
Tectonic platesThe Earth’s crust consists of several sections called tectonic plates.
Текст слайда:

Tectonic plates


The Earth’s crust consists of several sections called tectonic plates. Where they meet is called a plate boundary. Convection currents in the mantle move these tectonic plates. In some locations the tectonic plates are moving towards each other, in others they are moving away from each other and in others they are moving past each other.






















Слайд 4
Plate boundaries 1When two plates slide past each other, they don’t
Текст слайда:

Plate boundaries 1

When two plates slide past each other, they don’t do it smoothly. The large friction forces involved mean that strain builds up and the plates move suddenly when the strain gets too much.

This sudden movement of plates is called an earthquake and it can be very destructive.


Слайд 5
Plate boundaries 1
Текст слайда:

Plate boundaries 1


Слайд 6
Why do earthquakes happen?
Текст слайда:

Why do earthquakes happen?


Слайд 7
Epicentre of an earthquake
Текст слайда:

Epicentre of an earthquake


Слайд 8
Primary and secondary wavesDuring an earthquake the two types of wave
Текст слайда:

Primary and secondary waves

During an earthquake the two types of wave that are released from the epicentre are primary waves (p-waves) and secondary waves (s-waves).

Primary or p-waves are the fastest. They are longitudinal in nature and when they hit the surface they make objects and buildings vibrate vertically. They can travel through solids and liquids.

Secondary or s-waves are the slowest. They are transverse in nature and when they hit the surface they make objects and buildings vibrate horizontally. They can only travel through solids.


Слайд 9
S-waves…… ShakeP-waves arrive first and shake building vertically. Little damage is
Текст слайда:

S-waves…… Shake




































P-waves arrive first and shake building vertically.
Little damage is caused.

S-waves arrive next and shake building horizontally.
This can cause a lot of damage.


Слайд 10
Seismic wavesWaves within a layer change direction gradually because there is
Текст слайда:

Seismic waves









Waves within a layer change direction gradually because there is a gradual change in density.

At a layer boundary there is a big change in direction because there is a big change in density between layers.


S wave shadow only p waves received here


Слайд 11
Task 2 – Seismic wavesOuter coreMantleABWhat type of wave is A?
Текст слайда:

Task 2 – Seismic waves

Outer core


Mantle




A

B

What type of wave is A? How do you know?
Explain the path of wave B in terms of density.
What is the s wave shadow?


Слайд 12
Outer coreCrustMantleInner coreAttach labels to the correct part of the diagram.
Текст слайда:

Outer core

Crust

Mantle

Inner core

Attach labels to the correct part of the diagram.


Слайд 13
Task 3 – Tectonic platesPlate APlate BAn earthquake has occurred in
Текст слайда:

Task 3 – Tectonic plates

Plate A

Plate B



An earthquake has occurred in the area shown in the picture below. Draw what the location would look like after the earthquake if the plates moved in the directions indicated by the arrows.



Слайд 14
Match the word with the description:EpicentrePrimary wavesSecondary wavesThe faster seismic wave,
Текст слайда:

Match the word with the description:

Epicentre

Primary waves

Secondary waves

The faster seismic wave, that is longitudinal and makes buildings vibrate up and down.

The location where the shift in plates occurred producing seismic waves.

The slower seismic wave, that is transverse and makes buildings shake from side to side.


Слайд 15
Fill in the table below:
Текст слайда:

Fill in the table below:


Слайд 16
Plate boundaries 2What happens when an oceanic plate and a continental
Текст слайда:

Plate boundaries 2


What happens when an oceanic plate and a continental plate collide?

The thinner, more dense oceanic plate is driven down into the mantle.



Convection current

Convection current

Oceanic plate melted

This is known as SUBDUCTION!

Thicker, less dense continental plate


Thinner, more dense oceanic plate


Слайд 17
Plate boundaries 2
Текст слайда:

Plate boundaries 2


Слайд 18
Convection currentConvection current    ← Oceanic plate
Текст слайда:


Convection current

Convection current



← Oceanic plate

Oceanic plate →

What happens when oceanic plates move apart due to convection currents in the Earth’s mantle?

Magma moves up to the surface, cools and forms new oceanic plate.

This is known as SEA-FLOOR SPREADING.



Plate boundaries 3


Слайд 19
Constructive Plate BoundaryPlate boundaries 3
Текст слайда:

Constructive Plate Boundary

Plate boundaries 3


Слайд 20
Match the word with the description:SubductionSea-floor spreadingFrictionThe force that causes earthquakes.When
Текст слайда:

Match the word with the description:

Subduction

Sea-floor spreading

Friction

The force that causes earthquakes.

When oceanic plate is pushed down into the mantle as it collides with continental plate.

When two oceanic plates move apart to create new crust.


Слайд 21
Continental DriftIt is thought that the continents were once joined together
Текст слайда:


Continental Drift

It is thought that the continents were once joined together in a huge super-continent called Pangaea.

Over millions of years the continents drifted apart because the tectonic plates they were on moved apart due to convection currents in the Earth’s mantle.







Слайд 22
Continental Drift
Текст слайда:

Continental Drift


Слайд 23
Evidence for continental drift theory:The shapes of the continents fit like
Текст слайда:

Evidence for continental drift theory:

The shapes of the continents fit like a jigsaw.
The rock strata on separated continents are identical.
The fossil records on separated continents are identical.











Continent A

Continent B


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