Page 250 - New Medley 5 Semester 2

Competencies
C-3.2

• Critical Thinking
• Understanding
21st CENTURY SKILLS • Problem Solving
• Digital Integration
7 Natural Disasters

Warm Up • Critical Thinking

Natural disasters always make the life of people miserable.
Can you define how is the situation shown in the picture
caused?

A natural disaster is an unexpected event that causes harm to human life,

property, animals and the environment. It may occur at any time. Some such
disasters are earthquakes, volcanoes, tsunami, oods, drought, etc.

EARTHQUAKES

An earthquake is a sudden shaking of the ground caused by movements or
vibrations deep inside the earth. ese vibrations release great energy and cause

the ground to quiver. Earthquakes of high intensity o en cause great destructions.

How an Earthquake Occurs

e earth’s crust is made of many rock plates. e layers of the earth under the

plates are hot and in a molten state. ese layers are moving constantly which

causes the plates to slide smoothly against each other. However, at times, the

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