6. 2. The Earth´s surface: Tectonic Plates
The Litosphere is composed of the crust and the upper mantle, but you have
to take into account that there are part of the crust that is in the oceans…
7. • The Litosphere is composed of the crust and the upper mantle, but you
have to take into account that there are part of the crust that is in the
oceans…
11. How it occur?
Tectonic Plates for kids https://www.youtube.com/watch?v=kwfNGatxUJI
https://www.youtube.com/watch?v=_kF-IKbavDA
https://www.youtube.com/watch?v=tcPghqnnTVk OK
Wegener theory https://www.youtube.com/watch?v=zbtAXW-2nz0
30. Continental Relief:
plains
Are low, flat areas of
land. Large plains are
often found on the
coast, and are formed
by large rivers.
What is the
difference between a
plateau and a plain?
32. Coastal relief: gulfs and capes
Cape or headland is a part of
the coast that extends to the
sea.
Gulf is a large part of the
ocean or the sea partially
enclosed by land. A bay is a
small gulf.
41. The upper-course of a river
V-shaped Valley - a valley
which resembles a 'v' in cross
section. These valleys have
steep sloping sides and
narrow bottoms.
Waterfall - Waterfalls usually
occur where a band of hard
rock lies next to soft rock.
They end up creating steep
sided valleys known as gorges
or canyons.
42. The middle-course of a river
• Here the river channel has
become much wider and deeper
as the channel has been eroded
and the river has been fed by
many tributaries upstream.
• •As well as changes in the river
channel, its surrounding valley
has also become wider and
flatter in cross-section with a
more extensive floodplain.
• •Unlike the relatively straight
channel of the upper course, in
the middle course there are many
meanders (bends) in the river.
43. The lower course of a river
As a river continues its journey
towards the sea, the valley cross
section continues to become
wider and flatter with an
extensive floodplain either side
of the channel.
When the river floods over the
surrounding land it loses energy
and deposition of its suspended
load occurs. Regular flooding
results in the building up of layers
of nutrient rich alluvium which
forms a flat and fertile floodplain
44. Features in the mouth of a river
Deltas are found at the mouth of
large rivers - for example, the Nile,
Ebrus or Mississippi. A delta is
formed when the river deposits its
material faster than the sea can
remove it.
Estuary: A partially enclosed
body of water along the coast where
freshwater from rivers and streams
meets and mixes with salt water
from the ocean.
47. LAKES: are permanent masses of water which have
accumulated inland
When they are small they
are called ponds. If their
water is salt water they
are called inland seas
(Caspian Sea)
The water in lakes has
different origins:
•Precipitation
•Rivers and groundwater
•Glaciers
48.
49. Groundwater
Runs and is stored under the ground.
It represents 25% of the water on
the continents.
Most groundwater comes from
precipitation. When it rains, some
water penetrates the ground and
filters through porous rocks. When it
reaches permeable rocks, it cannot
pass through and forms aquifers and
underground rivers and lakes.
In limestone areas, water dissolves
the rock and creates caves and
caverns with stalactites and
stalagmites
50. Glaciers: are large, slow moving, masses of ice, that
deform and move downslope under their own weight. They
may be considered “rivers of ice”
Approximately 10% of the
earth's surface is covered
by glaciers. Large areas of
glacial ice are found in high
latitude areas such as
Greenland and Antarctica,
however glaciers are also
found in areas of high
altitude
(e.g. the Rockies, Alps,
Himalaya).
But we can find rest of
glaciers in Spain too.
53. 6. Natural Hazars
VOLCANIC ERUPTIONS
- A vulcano is an opening in
the Earth´s crust through
which molten rock (lava,
gases, fire, smoke and ash
)are ejected.
- During an eruption, there
are often big explosions,
which throw out cinders
and pieces of rock.
- Not all volcanoes are active.
Some are completely
extinct, other which began
erupting a long time ago,
remain dormant.
54.
55. EARTHQUAKES
Are tremors or shaking in
the Earth´s crust that can
cause fisures and
movements on the Earth´s
surface. The strenght of the
tremors is called magnitud.
We measured the magnitude
with an instrument called
seismograph and we creates
scales with the information
obtained. One of the best-
known scales is the Richter
scale.
56.
57. TSUNAMIS: Is an
earthquake caused in the
sea, it´s epicentre was in
the sea, and the seismic
waves cause enormus
waves in the water.
https://www.youtube.com/wat
ch?v=PkIM7uwJ3Eg
