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Those disasters, which are mainly caused by nature, are called the natural disaster. They are geographical and meteorological. Deforestation, landslides, flood, volcano etc. are some examples of natural disaster.

Flood

The overflow of water in rivers, oceans etc. that enters into human settlement and causes great harm is called flood. Rain is not only the cause of the flood. But in the context of Nepal, rain is regarded as the main agent that causes the flood.

Preventive measures of flood

Some major preventive measures of flood are as follows:

  1. Construction of a dyke (flood embankments) parallel to the rivers is preferred for the blockage of the flood.
  2. Intensive grazing and deforestation must be controlled.
  3. The glacial lakes, which seem to possess the possibility of outburst should be identified and drained out to minimise damage.
  4. We should conduct various educational programmes to aware people.
  5. Flood measuring stations should be made at flood regions.

Landslide

The sliding down of a piece of land under the force of the gravitational pull of a mountain or hillside is called the landslide. Landslide is a natural process in which rocks debris or parts of land move downwards under the force of gravity.

Preventive measure of landslide

Some major methods of preventing landslide are as follows:

  1. Afforestation should be promoted and intensive grazing by domestic animals should be avoided.
  2. Construction of roads and dams should be restricted to fragile areas.
  3. People should be aware of the cause of the landslide.
  4. Terrace farming on the hills slows down the rate of landslides.

  • Those disasters, which are mainly caused by nature, are called natural disaster.
  • The overflow of water in rivers, oceans etc. that enters into human settlement and causes great harm is called flood.
  • The sliding down of a piece of land under the force of gravitational pull on a mountain or hillside is called landslide.
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Very Short Questions

Those disasters which are mainly caused by nature are called natural disasters. E.g.: flood, landslide, cyclone etc.

Any four effects of natural disasters are given below:
i) Loss of human beings and properties.
ii) Loss of agricultural land and its fertility.
iii) Loss of plants and animals.

When the dry land is filled with water overflowing from the rivers or lakes or oceans, it is called flood.
Any four causes of flood are:
i) Heavy rainfall
ii) Increasing Urbanization
iii) Outbrusting of a glacial lake.
iv) Outbrusting of lake formed by landslide
v) Destruction of dam
vi) Deforestation

The effects of flood are given below:
a) The flood causes loss of lives of human beings, animals and land as well.
b) It deposits the sediments in its way. It may change the structure of the land.
c) It causes pollution in the sources of water and rivers.
d) It causes epidemic diseases due to rotten dead bodies.
The methods of controlling flood are listed below:
a) Watershed management.
b) Use of engineering technology to control the flow of water in the rivers.
c) Preparation of Flood hazard Map Depending on the geological structure.

Any three measures of flood are given below:
a) It should not be allowed to make houses and other physical infrastructure near the bank of rivers and streams.
b) The people affected from blood should be displaced towards a safer place in time.
c) The people living on the bank of rivers should be informed about the upcoming disaster in time if possible.
d) The flood affected people should be provided with the necessary things like residence, food, clothes etc.

Public awareness can play the vital role in controlling flood. If public are made aware of the flood, they will try to protect themselves from the flood. For this, they will apply different methods. Such as afforestation, terrace cultivation etc. This will help in preventing from theflood.

'Public awareness' is the single preventive measure for both flood and landslide. Erosion, Flood and landslide disturb the position of rocks. Such disturbances create a vibration of the earth and we experience an earthquake.
Himalayan ranges are considered as an active earthquake area. Nepal is situated in this region. So, the earthquake is frequent in Nepal.

Landslide is a natural process in which rocks debris or parts of land move downwards under the force of gravity.
Or,
The sliding down a piece of land under the force of gravitational pull on a mountain or hillside is called landslide. It may be Soilslide or rockslide.
Any four causes of landslide are:
a) Heavy rain
b) Earthquake
c) River cutting
d) Deforestation
e) Unscientific agriculture system
f) Use of inappropriate technology in the physical infrastructure etc.

Any four effects of landslide on environment are given below:
i) When the landslide blocks the flow of water in rivers or streams, it may cause flood and pollutes the water resources.
ii) It destroys development structures like roads, communication network, bridges etc.
iii) It reduces forest and leads to deforestation and reduction of wildlife.
iv) It sweeps the agricultural land and sometimes becomes responsible for the death of people and domestic animals.

The ways to check landslide in our village are listed below:
i) Afforestation should be promoted and intensive grazing by domestic animals should be avoided.
ii) Construction of roads and dams should be restricted in fragile areas.
iii) Terrace farming with ditches on hills slows down the rate of landslide.

The preventive measures of landslide are:

  1. Afforestation should be promoted and intensive grazing by domestic animals should be avoided.
  2. Construction of roads and dams should be restricted in fragile areas.
  3. People should be aware of the cause of landslide.
  4. Terrace farming on the hills slows down the rate of landslides.

0%
  • The sliding down of a piece of land under force of gravitational pull on a mountain or hillside is called ______.

    hurricane


    landslide


    flood


    tsunami


  • Which one of the following is the natural cause of landslide?

    Intensive grazing
    Mining
    Deforestation
    volcanic eruption
  • The provinces with the greatest number of disastrous landslides are ______.

    Newfoundland and Alberta


    Alberta and British Columbia


    Quebec and Ontario


    British Columbia and Quebec


  • Damage to buildings during landslides can be caused by ______.

    flooding upstream of a landslide dam


    all options are correct


    collapse of ground under the building


    collision from heavy debris


  • Land slide is active in ______.

    forest hill


    fragile hill


    terrace farmed hill


    strong hill


  • The overflow of water in rivers, oceans etc. that enters in human settlement and causes great harm is called ______.

    landslide


    earthquake


    volcano


    flood


  • Which one of them is not the effect of flood?

    reduces food production
    increases fertility of lands
    destroys life and their habitats
    causes landslides and soil erosion
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