Heat is trapped by glass, and hence the temperature inside a glass enclosure will be much higher than the surroundings. This phenomenon was used to create an enclosure where tropical plants could be kept warm during the winters in colder climates. Such enclosures are called greenhouses. Greenhouses have also lent their name to an atmospheric …
Tsunami is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean, river or a large lake.
The electrical charges produced by rubbing are called static charges.
The process of electric discharge between clouds and the earth or between different clouds causes lightning.
The process of transfer of charge from a charged object to the earth is called earthing.
Destructive energy of an earthquake is measured on the Richter scale. The earthquake measuring 7 or more on Richter scale can cause severe damage to life and property.
Earthquakes tend to occur at the boundaries of earth’s plates. These boundaries are known as fault zones.
Protection against EarthquakesWe know from the earlier pages that earthquakes cannot be predicted. We have also seen that they can be highly destructive. It is, therefore, important that we take necessary precautions to protect ourselves all the time. People living in seismic zones, where the earthquakes are more likely to occur, have to be specially …
The tremors produce waves on the surface of the earth. These are called seismic waves. The waves are recorded by an instrument called theseismograph . The instrument is simply a vibrating rod, or a pendulum, which starts vibrating when tremors occur. A pen is attached tothe vibrating system. The pen records the seismic waves on …
The power of an earthquake is expressed in terms of a magnitude on a scale called the Richter scale.Really destructive earthquakes have magnitudes higher than 7 on the Richter scale. Both Bhuj and Kashmir earthquakes had magnitudes greater than 7.5.
