sculpturing the earth surface
TRANSCRIPT
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A. Endogenous processes which occur beneath the surface of the Earth.
B. Exogenous processeswhich take place above the Earth’s surface.
Note: these two major are responsible in the changes of landscapes in the different regions of the world.
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Plate tectonics (from the Late Latin tectonicus, from the Greek: τεκτονικός "pertaining to building") is a scientific theory that describes the large-scale motions of Earth's lithosphere.
The lithosphere is broken up into tectonic plates. On Earth, there are seven major plates and many minor plates.
Plates is made up of thick slabs of rocks.PLATES is composed of a continental crust and an oceanic crust
is composed of a continental crust and
an oceanic crust
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Pacific
North American
South American
African
Eurasian
Antarctic
Indo-Australian
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STRESS a force that acts on rock to change its shape or volume.
Deformation: The Breaking,
Tilting, and Folding of rocks
Prefix de = undo
Form = shape or configuration
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1.Tension – pulls
on the rocks of
the crust
stretching rocks
so that it
become thinner
in the middle.Think: Divergent
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2.Compression
– squeezes the
rocks of the
crust until it
folds or break. Think: Covergent
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3. Shearing –pushes a mass
of rock in two
opposite
directions.
Think: transform
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Movements of plates
When the plates move and interact with each other and bring about
1. DIASTROPHISM 2. VULCANISM
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Earth’s crust brought by
tectonic forces or the
movements of the
plates.
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1.Faulting this movement refers to the
fracturing or breaking of
rock masses or the Earth’s
crust.
this usually happens when the
rock masses are under tension
due to plate movement.
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1. Normal faults occur when tensional
forces act in opposite directions and
cause one slab of the rock to be
displaced up and the other slab down.
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2. Reverse faults develop when
compressional forces exist compression
causes one block to be pushed up and
over the other block.
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3. Graben fault is produced when tensional
stresses result in the subsidence of a block
of rock. On a large scale these features are
known as Rift Valleys.
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4. Horst fault is the development of
two reverse faults causing a block of rock
to be pushed up.
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5. Strike slip or transform fault
are vertical in nature and are
produced where the stresses
are exerted parallel to each
other.
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Result of displacement of structures on the earth’s crust.
2. Folding occurs when the Earth’s crust is compressed due to plate movement.(into collision)
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1. Anticline – fold that forms an upward arch.
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2. syncline– fold that forms a downward arch.
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3. Monocline--fold involves a slight bend in otherwise parallel layers of rock.
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Is another process that takes place
beneath the Earth’s crust.
This happen when molten materials
from the interior of the earth forced
into the crust and even onto the
Earth’s surface because of high
pressures with the Earth.
Is both constructive and destructive.
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Magma is a molten materials that still inside the Earth.
is a hot liquid rock below the surface of the Earth
Lava--- once they are spewed out of the Earth’s surface and solidified.
--- melted rock from a volcano.
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Fertile soils.
Rich in sulphur deposits.
Sources of geothermal energy.
Bring damage to man: Damage to human lives
Crops
Property
Faulting and folding
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1.Weathering– this refers to the breaking up of solid rocks into fragments. It is also the process that results in the chemical decay of soli rocks in place or near the surface of the Earth.
Two kinds of Weathering1.Physical or mechanical weathering
Refers to the disintegration or breaking down of solid rocks into smaller fragments.
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2. Chemical weathering
Is the breaking down of rocks and
minerals with a change in their
chemical composition.
Is also the result of chemical
reactions bet. The rock mineral and
the moisture, rain water, sea water
and organic acids produced by
plants and animals.
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Oxidation
Hydration
Hydrolysis
Carbonation
solution
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2. Erosion– is the movement of weathered
materials like rock fragments and particles of
soil that have been broken down and
carried by the different agents of erosion.
3. Deposition– is the process of
accumulation of soil particles and other
materials carried by the agents of erosion.
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