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SAI INTERNATIONAL SCHOOL
Class-6

Lesson Notes
Subject-Physics
Ch.- Water: The Life-giving Liquid
Subtopic- Droughts, Floods and Water Pollution

Droughts:
 During summer, sometimes rain doesn't happen for a long period of time. This
leads to scarcity of water. With times, the rivers and lake start to dry up. The
soil also becomes dry due to transpiration through plants and there is no
addition of water. This condition is called drought.
 As a result of droughts, plants and animals die due to lack of food and
starvation. This period of time is called famine.

Floods:
 Sometimes, heavy rainfall over a period of days causes rivers to flow beyond
their banks and water spills onto the land. This condition is called flood.
 The affected areas are often covered and contaminated with hazardous
materials, such as sharp debris, pesticides, fuel and untreated sewage.
 It leads to outbreaks of deadly waterborne diseases such as typhoid,
hepatitis-A and cholera, leading to epidemics.
 An epidemic is an infectious disease that affects thousands of people at the
same time in a particular region.