Some Natural Phenomena

Science Class 8 : Chapter 15

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Quick Revision : Some Natural Phenomena

  • Lightning: Electric discharge between clouds or between clouds and earth.
  • Electric Charges: Two types - positive and negative. Like charges repel, unlike charges attract.
  • Charging by Rubbing: Objects gain electric charge when rubbed with certain materials.
  • Electroscope: Device to detect electric charge using aluminum foil strips.
  • Earthing: Process of transferring electric charge to the earth for safety.
  • Lightning Conductor: Metallic rod installed on buildings to protect from lightning.
  • Earthquakes: Sudden shaking of earth caused by disturbances deep in earth's crust.
  • Seismograph: Instrument that records seismic waves during earthquakes.
  • Richter Scale: Measures earthquake magnitude. Above 7 is destructive.
  • Safety Measures: During lightning - avoid open spaces; During earthquakes - take shelter under tables.

Questions

Chapter Summary : Some Natural Phenomena

What You Will Learn: This chapter covers two destructive natural phenomena - lightning and earthquakes. It explains electric charges, charging by rubbing, types of charges, transfer of charge, lightning formation and safety, earthquake causes, measurement, and protective measures.

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