2. What are the main features of a
river basin?
The source, the tributaries, the
confluence, the watershed and the
mouth.
3. How do rivers shape the land?
Erosion is the process by which the surface of
the Earth gets worn down. Erosion can be
caused by natural elements such as wind and
glacial ice.
4. How do meanders lakes form?
• A meander, is a bend in a sinuous watercourse
or river. A meander is formed when the moving
water in a stream erodes the outer banks and
widens its valley and the inner part of the river
has less energy and deposits what it is carrying.
River Cauto
Cuba
5. What happens to a river as it
approaches its mouth?
• A river changes shape as it flows from its source (where
a river starts) to its mouth (where a river flows into a sea
or lake). The shape of both the long profile (a slice
through the river from source to mouth) and the cross
profile (a slice across the river) changes.
6. What is the hydrological cycle?
• Water cycle, is the continuous transfer of water
from the oceans into the atmosphere, the onto
the land and finally back into the oceans, with
processes (evaporation, transpiration,
condensation, precipitation and surface run-off).
7. What is the relationship between
precipitation and run-off?
•
The flood hydrograph it is the
relationship between precipitation and
the level of a river.
8. River flooding
• CAUSES:
• Physical: 1. Type and amount of precipitation. 2. Type of
soil and underlying rock
• Human: 1. Land use of the river basin. 2. Human activity.
• RESULTS:
• When rivers flood they can put lives in danger, damage
property and disrupt people’s normal way of life.
10. How do waves wear away the
land?
Waves are formed by submarine earth
movements and by the wind blowing over
the sea.
11. How does the sea transport
material?
Waves rarely approach a beach at
right-angles. They usually approach at
an angle that depends upon the
direction of the wind.
12. How do landforms result from
deposition by the sea?
Deposition occurs in sheltered areas
where the build-up of sand and shingle
is greater than its removal.
13. What are the causes, effects and
human responses to cliff erosion?
• Causes to cliff erosion.
•
•
If resistant rock, waves erode at their
base causing them to become unstable
and to collapse.
If less resistant rock, rain can wash loose
material down to the cliff base. It can be
rapidly removed by waves.
14. Effects to cliff erosion
•
Villages, farms and campsites situated in
places that a few years ago were
considered safe, have been abandoned
and lost.
15. Human responses
• The natural rate of cliff erosion can be
accelerated by human activity. There are
arguments for and against trying to protect
cliffs from erosion.
16. Coastal flooding in Britain
• A storm surge is when the level of the sea
rises rapidly to a height well above that
which was predicted.
18. How does ice shape the land?
Glaciers form when there is an
interruption in the hydrological cycle: the
climate becomes cold enough for
precipitation to fall as snow, and water is
held in storage in the system.
19. What landforms result from
glacial erosion?
They result from differences in the rate of
erosion between glaciers in the main and
in a tributary valley.
20. What landforms result from
glacial deposition?
•Erratics
They are rocks and boulders picked up
and transported many kms. by the glacier,
and deposited in an area of different rock.
24. What are the main types of
rock?
-Igneous rocks (from volcanic activity):
Granite, basalt.
25. -Sedimentary rocks (either of small
particles of other rocks that have been
eroded and transported or of the
remains of plants and animals):
limestone, chalk, coal, sandstone.
27. What is weathering?
Weathering includes the breaking up
(disintegration) and decay
(decomposition) of rocks in places
where they formed.
28. How do differences in rock
type affect landforms?
•
The rocks resistance
The harder the rock, the more
resistant it is likely to be to
erosion. Hills and mountains tend
to form in areas of harder rock
while valleys are found on softer
rock.
29. • Permeability
Impermeable rock has numerous surface
rivers and may be badly drained, in
contrast to permeable rock which has
few surface rivers; groundwater instead.
30. What do chalk areas look like?
• Chalk, which is a soft limestone, occurs in
south-east England. It is permeable and
so, as it is relatively resistant to erosion, it
can form.
31. Why does Carboniferous limestone
create its own scenery?
• It is a rock consisting mainly of calcium
carbonate, which comes from the remains
of sea shells and coral. Types of limestone
are Carboniferous limestone, Jurassic
limestone and Chalk.
32. • Resurgence…
The river flow over the impermeable rock
until it reaches the surface. The place
where it reappears is called resurgence.
33. What are the effects of quarrying in
National Parks?
•
Quarrying…
It is when rocks are taken straight from the
Earth’s surface –unlike mining where
workers have to operate underground.
35. Earthquakes
They occur in long narrow belts. The largest one
goes around the entire Pacific Ocean. The
second one runs through the middle of the
Atlantic Ocean for its entire length. The third one
is across the continents of Europe and Asia from
the Atlantic to the Pacific.
36. Volcanoes
• They form where the liquid rock, or lava,
escapes onto the Earth’s surface. Lava
can escape by either a gentle or a violent
movement. This gives two types of
volcano.
38. Ring of Fire
• The largest belt goes around the entire Pacific
Ocean, the so-called ‘Pacific Ring of Fire’. The
second one runs through the middle of the
Atlantic Ocean for its entire length. Three other
notable locations are in southern Europe, the
centre of the Pacific Ocean, and eastern Africa.
39. How can the effects of a tsunami
be reduced?
a) Predict where and when the event might
happen.
b) Prepare local people and emergency
services for the disaster should it occur.
40. Pangea
• Pangea was the only continent that
existed at the end of the Paleozoic and
early Mesozoic grouping most of the land
surface of the planet. It was formed by the
movement of tectonic plates.
43. What are the main types of
rainfall?
Britain receives three types of rainfall:
Relief rainfall, frontal rainfall, and
convectional rainfall.
July is often the wettest month in places in
the east.
44. Britain´s climate
• Britain’s average climate is cool summers,
mild winters and rain spread evenly
throughout the year, so equable or
temperate is its definition.
45. What's weather like in a
depression?
• Depressions are areas of low pressure which
usually bring rain, cloud and wind.
• They develop to the west of the Isles overt the
Atlantic Ocean, because a mass of warm, moist
tropical air from the south meets a mass of
colder, drier polar air from the north.
46. What is the weather like in an
anticyclone?
• Anticyclones are areas of high pressure.
They tend to remain stationary for several
days, giving very dry, bright and settled
weather.
48. British climate
• Seasonal climate with cool summers, mild
winters and rain throughout the year.
• Wet, and receiving rainfall throughout the
year, due to prevailing south-westerly
winds bring in moist air from the Atlantic
Ocean.
49. Mediterranean climate
• Summers are hot and dry. Winters are
warm and wet.
• If drought conditions in summers, are due
to the prevailing winds blowing from the
dry land, winters can be very wet.
50. Cold climate
• Winters are long and cold. Short cool
summers. Small amounts of rainfall.
Places north of the Arctic Circle have a
period when the sun never rises above the
horizon.
51. Equatorial climate
• Hot, wet and humid throughout the year.
There are no seasons and the weather is
the same almost every day.
• Rainfall in equatorial climate exceed 2000
mm a year.
52. Hot desert climate
• Very hot summers and cooler winters. Dry
throughout the year. Hot desert climates
are typically found under the subtropical
ridge where there is largely unbroken
sunshine for the whole year due to the
stable descending air and high pressure.
53. Tropical continental climate
• Also called savanna. A seasonal climate
with a very warm, dry season and a hot,
wet season. Temperatures high through
the year, with small annual range
• During the dry season the prevailing trade
winds blow from the east.
54. THE GREENHOUSE EFFECT
• The Earth is surrounded by a layer of
gases, including carbon dioxide. This
keeps the Earth warm by preventing the
escape of heat that would normally be lost
from the atmosphere. The gases act
rather like the glass in a greenhouse. They
let heat in but prevent most of it from
getting out.
55. • The burning of fossil fuels such as oil, coal
and natural gas produces large amounts
of carbon dioxide. As the amount of this
gas increases, the Earth becomes
warmer.
