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Jameela Chowdhury 13A6

Earthquakes
An earthquake is the shaking and vibration of the Earth's crust due to movement of the
Earth's plates (plate tectonics). Earthquakes can happen along any type of plate
boundary.

Earthquakes occur when tension is released from inside the crust. Plates do not always
move smoothly alongside…

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Jameela Chowdhury 13A6

TSUNAMIS
A tsunami is a huge wave, usually caused when an earthquake, volcano or landslide
happens on the ocean floor, which can eventually crash onto the shoreline. water is
displaced. This water forms the start of the tsunami. Tsunamis occur most often in the
Pacific Ocean and…

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Jameela Chowdhury 13A6
Boxing Day Tsunami 2004

On 26 December 2004 a tsunami occurred in the Indian Ocean. It was the result of the
Indio-Australian Plate subducting below the Eurasian Plate. It was caused by an
earthquake measuring more than magnitude 9. The earthquake caused the seafloor to
uplift, displacing…

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Jameela Chowdhury 13A6
Widespread damage of the infrastructure, shortages of food and water, and economic
damage.

Even beach resorts in parts of Thailand which were completely untouched by the
tsunami were hit by cancellations.

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Jameela Chowdhury 13A6

Volcanic Eruptions
Volcanoes form when magma reaches the Earth's surface, causing eruptions of lava
and ash. Volcanic eruptions can happen at destructive and constructive
boundaries, but not at conservative boundaries. When magma reaches the Earth's
surface it is called lava. When the lava cools, it forms rock.…

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Jameela Chowdhury 13A6

Landslides
Landslides occur when the stability of the slope changes from a stable to an unstable
condition. A change in the stability of a slope can be caused by a number of factors, acting
together or alone.

Natural causes:

· Erosion of the toe of a slope…

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Jameela Chowdhury 13A6

Wildfires
A wildfire or wildland fire is an uncontrolled fire in an area of combustible vegetation that
occurs in the countryside area. Other names such as brush fire, bush fire, forest fire may be
used to describe the same phenomenon depending on the type of vegetation being…

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Jameela Chowdhury 13A6

Droughts
Droughts occur when a long period of abnormally dry weather leads to a severe water
shortage. Droughts are also often caused by the activity of humans and can have devastating
effects.
Human activities that can help trigger droughts include:
Deforestation and soil erosion: Widespread cutting down…

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Jameela Chowdhury 13A6

Floods
A flood occurs when a river bursts its banks and the water spills onto the floodplain. Flooding
tends to be caused by heavy rain: the faster the rainwater reaches the river channel, the
more likely it is to flood. The nature of the landscape around a…

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Jameela Chowdhury 13A6

Cyclones/Hurricanes

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