NATURAL DISASTERs

NATURAL DISASTERs. NCERT 5th Class CBSE Social Science Natural Disasters Class Notes.

Natural activities taking place in the earth's crust, as well as surface, are the main reasons for disasters. The natural events that cause loss of life and properties and sometimes disturb the ecosystem are called natural disasters. It causes widespread destruction, major collateral damage, or loss of life. Its factors can result in deaths, property destruction, and social and environmental disturbance. It includes floods, hurricanes, tornadoes, volcanic eruptions, earthquakes, tsunamis, storms, etc. Worst natural disaster in the world Central China Flood of 1931 (2 Million–3.7 Million Deaths) -53 million people were directly affected - covered an area of approximately 180,000 square kilometers (Equivalent to the size of England and half of Scotland combined - 200,000 people died when they were in sleep. Millions died due to water-borne diseases like cholera and typhoid. The 2019 Indian floods - due to excessive rains. Karnataka and Maharashtra were the most severely affected states. Many were rescued with the help of the Indian Navy. It was the heaviest monsoon in the last 25 years. More than 1600 people died between June and October 2019. Thirteen states of India were affected – from July–to September 2019. News reports later stated that 500 people were missing and home-less..

Earthquake. Sudden shaking or trembling movement on the earth’s surface is called an earthquake. The causes of the earthquake are tectonic causes, volcanic causes, and other causes. When two tectonic plates move suddenly against each other it causes an earthquake. We can measure the intensity of the earthquake and its point of origin or hypocentre with the help of a Seismograph..

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