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The Changing Earth

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Clases Aula24LMS

on 2 March 2015

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Transcript of The Changing Earth

Shape of the Earth
Earth is not a perfect sphere. It is flattened at the poles. We call this shape a
The Changing Earth
There are forces inside Earth that can break the lithosphere and bring materials from inside Earth to the surface.
to this online lesson!
My name is Andrea Martinez
I'm an English teacher for
I live in Monterrey, N. L
We will learn about the features of the Earth and its internal and external changes.
Size of the Earth
The Sun is more than a million times bigger than Earth.

Composition of Earth's atmosphere

= Water
= Clouds and
bodies of ice
= Landforms
The hydrosphere is the liquid water component of the Earth.
It includes the oceans, seas, lakes, ponds, rivers and streams.

It is made up of a large layer of gases that surrounds the Earth.

The lithosphere is the solid part of the Earth.
Part of the lithosphere is under the oceans. The other part is above the oceans and forms the continents and islands.
The Lithosphere

: Meteorological phenomena occur .
: Protects us from
the ultraviolet radiation .
: Meteors burn up while entering the Earth’s atmosphere .
(1) Nitrogen: 80%
(2) Oxygen: 20%
(3) Other gases, which include argon, carbon dioxide, methane, and some inert gases (helium, neon, etc.)
The Earth's layers
is made of solid rock.
contains extremely hot rock that sometimes flows like molasses.
outer core
is liquid and the
inner core
is solid which is believed to be composed primarily of iron and some nickel.
The changes on the Earth’s surface occur as a result of the internal and external forces of the Earth.

internal forces
create the surface relief. The
external forces
erode the surface relief little by little
volcanic eruptions
Earthquakes occur when internal forces move what are known as plates under the earth’s crust. They knock against each other and cause very intense seismic waves.
Richter scale, developed by Charles Richter in 1935.
City Hall Tower of San Francisco after the 1906 earthquake.
External forces
of the Earth include wind, water and people that erode the relief of Earth’s surface.
There are very hot substances inside Earth that sometimes break through to the surface.

They come out through volcanoes.
The City of Pompeii during
the eruption of Mt. Vesuvius in 79 A.D.

Pompeii was destroyed and laid buried under four meters of ash and rock until the 18th century, when archaeologists began to dig the city out.


erosion of the ground
Three phases:
transport of eroded material
deposition of these materials in other places
Causes of erosion
Causes of erosion
People cut down forests, cause fires, build slopes, etc.
Transporting Materials
Eroded materials are transported from one place to another by the wind, river currents and ocean water.
This occurs when the materials carried by water or wind are deposited.

The accumulation of these materials leads to changes in the landscape.
Let's watch the next video about the phenomena that shape our Earth:

Identify the Earth’s layers.
- Inner core
- Mantle
- Outer core
- Crust

Outer core
Inner core
Match the columns.
1. It is the solid part of the Earth.
2. It is used to measure earthquake
3. Our atmosphere is almost 80% of...
4. It is the constant wearing away of
rocks and soil.
5. The _______ layer protects us from the
harmful ultraviolet radiation from
the Sun.
6. The Earth’s shape is called...
7. It occurs when the materials carried
by the water or wind are deposited.
8. The __________ often cause earthquakes
and volcanic eruptions.

Now we have learned the features
of the Earth and its internal and external changes.

_____ nitrogen

_____ erosion

_____ lithosphere

_____ sedimentation

_____ geode

_____ ozone

_____ Richter scale

_____ internal

Great job!
Well done!
Full transcript