Physics Formulas for the chapter-Some Natural Phenomenon

Apr 26, 2022, 16:45 IST

Chapter-Some Natural Phenomenon of class 8 Science 

Lightning is a high-energy electric discharge accompanied by a large amount of heat and light.

Thunder is the sound made by lightning.

Earthquake istrembling or shaking movement of the earth's surface.

Liquefaction is the process by which water! saturated sand or soil temporarily loses: strength and acts as a fluid.

Air currents inside dark clouds cause water droplets and ice particles rub! and bang against each other which creates static electricity. Lighter, positive charges are at the top of the cloud and heavier, negatively-charged! pieces of ice and water at the base. The earth's surface is positively charged. Electricity flows between the charges and the difference between them increases. When the differences get big enough, they are neutralized and electricity is released as a flash of lightning. Because light travels much faster than sound, flash of lightning can be seen before the sound of thunder.

Strikes- Lighting always takes the quickest path to the ground and usually strikes tall isolated objects such as trees or tall buildings. This is why it is dangerous to shelter under trees during a storm.

Causes of earthquakes: compressional or tensional stresses built up at the margins of the huge moving lithospheric plates that make up the earth's surface The immediate cause of most shallow earthquakes is fracture in the earth's crust, resulting in movement of the opposing blocks of rock past one another.

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