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5 Evs

The document provides definitions and information about various natural calamities like floods, cyclones, droughts, earthquakes, etc. It discusses the causes and effects of these calamities and measures that can help prevent damage from them. Examples and short questions are also included for students to learn about these topics.

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gnilakiya2008
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10 views3 pages

5 Evs

The document provides definitions and information about various natural calamities like floods, cyclones, droughts, earthquakes, etc. It discusses the causes and effects of these calamities and measures that can help prevent damage from them. Examples and short questions are also included for students to learn about these topics.

Uploaded by

gnilakiya2008
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© © All Rights Reserved
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Class Notes

Class: V Topic: Lesson 10


Natural Calamities
Subject: EVS (To be written in EVS notebook)

❖ Definitions to Learn
➢ Natural calamity- A natural calamity is an event that is caused by natural forces
of the earth and causes great damage of life and properties. Some examples of natural
calamities are earthquake, flood, drought, tsunami, cyclone etc.

➢ Flood- A flood is the covering of land by great quantities of water. Flood


occur due to heavy rain, cyclone, breaking of dams etc.

➢ Cyclones – Cyclones are violent storms that usually occurs near the sea. During
such storms Sea water rushes onto the land, flooding miles of the coast.

➢ Dam - A dam is a barrier (like Wall) built across a river. Dams are built
mainly for making electricity and for taking water to the crops field.

➢ Embankments – Embankments are walls of the earth and stones on the


bank of the river. They are built to stop a river from overflowing onto the land.
Building embankments and keeping them in proper order help to prevent flood.

➢ Dykes – Dykes are built to stop sea water from rushing into land. Building dykes
and keeping them into proper order help to prevent flood.

➢ Check Dams – Check dams are small dams built across rivers. When enough
water collects behind them; it overflows into canals (passages for water) instead of
the surrounding land. It prevents flooding, and canals take water to their fields.
➢ Drought – A drought is a condition caused by shortage of water due to the lack of
rain for a long time. In this condition, rivers and ponds dry up, level of groundwater
goes down and earth becomes dry and dusty.

➢ Earthquake – To quake means to shake or tremble. Earthquake is the sudden


shaking of the ground caused by movements of the earth’s crust.

➢ Mantle – The layer of rocks around the core is called mantle.

➢ Core – Deep inside the earth is a solid ball of iron surrounded by a layer of molten
iron called core.

➢ Seismograph – Seismograph is an instrument which helps to measure the


strength of earthquake.

➢ Richter Scale – Scale on which strength of earthquake is measured is called


Richter scale. The highest strength of an earthquake measures 9 on the Richter
scale.
❖ Write short answers of the following questions.
Que. 1- Name three things that can cause floods.
Ans. -Three things that can cause floods are-
a) Very heavy rainfall in an area.
b) Cyclones (violent storms) near the sea.
c) Breaking of dams.

Q.2) What is a drought?


Ans.- Drought is a condition caused by shortage of water due to lack of rainfall from a
long period of time.

Q.3) How do houses made of light materials help in earthquake-prone areas?


Ans.- Houses made of a light material are helpful in earthquake-prone areas as even if
they collapse, they will not cause much harm.

Q.4 Name two flood-prone states of India?


Ans. Two flood-prone states of India are-
i)Bihar
Ii)Odisha

Q.5 Name three things that people do which cause drought?


Ans. Three things that caused drought are-
i)cutting down trees.
ii)not taking care of natural ponds and tanks.
iii)drawing out too much of underground water.
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Content absolutely prepared from home

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