⛪Home⇐ Class V Volcanoes, Earthquakes and Tidal waves


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Class V - science: Volcanoes_Earthquakes and Tidal waves
One Word Answer Questions:
Q) Which type of volcanoes erupt regularly or have erupted in the recent past and may erupt any time in future?
    
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Q) Which type of volcanoes are currently not erupting?
    
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Q) Which type of volcanoes have stopped erupting?
    
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Q) What is also known as tidal waves?
    
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Q) In 2004, Tsunami occurred in which ocean?
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Q) Earth's core or center of the earth contains molten?
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Q) An instrument used to measure earthquake is?
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Q) Tidal waves are also called as?
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Q) Richter scale is a scale that is used to describe the magnitude of?
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Q) Volcanoes are cracks in the earth's crust out of which is?
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Short Answer Questions:
Q) Explain about volcanoes.
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Q) Explain about active volcanoes.
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Q) Explain about dormant volcanoes.
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Q) Explain about extinct volcanoes.
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Q) Explain how an earthquake occurs and how it is measured?
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Q) Explain briefly Tidal Waves?
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Q) Explain briefly about earthquakes?
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Q) Explain briefly about Epicentre?
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Q) Explain briefly about seismograph?
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Q) Explain briefly about Richter Scale?
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Long Answer Questions:
Q) Explain briefly about the types of volcanoes.
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Q) Explain about the earthquake and its effect.
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Q) Explain about the tidal waves.
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Q) Explain about Active, Dormant and Extinct volcanoes.
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Q) Write a short note on Tsunami.
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Q) Explain In detail about earthquakes?
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Q) Explain in detail about Effects of an earthquake?
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Q) Explain in detail about Extinct Volcanoes?
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Q) Explain in detail about Volcanoes?
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Volcanoes
  1. Earth's core or center of the earth contains molten rock.
  2. Volcanoes are cracks in the earth's crusts through which this molten rock along with other gases and ash comes out.
  3. The molten rock inside the earth is called magma.
  4. When it flows on the surface of the earth it is called lava.
  5. Found in the form of conical mountains.
  6. Lot of pressure inside the earth that pushes up the magma or molten rock.
  7. This molten rock rushes out through a vertical tunnel called a vent and flows out through crater as lava.
  8. Lava cools, it solidifies and form rock.
volcanoes
Types of volcanoes

According to the nature of the eruption volcanoes are divided into three types

1). Active 2). Dormant 3). Extinct

Active Volcanoes:-

  • This type of volcanoes erupt regularly or have erupted in the recent past and may erupt any time in future.
  • There are 500 active volcanoes.
  • Majority of them are found around the pacific ocean.
  • Called "pacific ring of fire".
  • Ex:- Mount Vesuvius and mount fuji are two famous active volcanoes.

Dormant Volcanoes:-

  • This type of volcanoes are currently not erupting but, they may erupt in future.

Extinct Volcanoes:-

  • This type of volcanoes have stopped erupting, because they no longer have a lava supply.
  • Many of them are found in Hawaiian island.
Earthquakes
  • Sudden shaking of a part of the earth's surface is called an earthquakes.
  • Caused by shock waves that travel through solid rocks from under ground of the surface.
  • Sudden displacement of rocks over a large area below the earth's surface it causes shaking of the ground.
earthquakes

Focus:-

  • The point inside the earth where an earthquake starts.

Epicentre:-

  • Area on the earth's surface just above the focus is called the epicenter.

Maximum damage is caused here.

  • After the first big shaking, smaller shaking or tremors occurs these are called after shocks.
  • After shocks may continue for several days.
  • On Jan-26-2001 bhuj and its neighbouring districts in Gujarat suffered heavy losses of life and property.
  • About 20,000 people were killed.
  • Bhuj was the epicenter of that earthquake.

Measurement of an Earthquake

Seismograph:-

  • The intensity, Direction, and duration of an earthquake is detected and recorded by an instrument called seismograph.
seismograph

Richter Scale:-

  • Is used for describing the magnitude of earthquake.
  • When the measurement is 5 or more on richter scale the magnitude of the earthquake is taken to be high.

Effects of an earthquake

  • Huge destruction.
  • Buildings collapse.
  • Roads and bridges get damaged.
  • Trees get uprooted.
  • All this happen so suddenly that people do not get chance to run out of their homes and save their lives.
  • Breaking of electric wires, fire break out.
  • Under sea earthquakes sometimes cause tsunami that cause widespread destruction.
effects1
Tidal Waves
  • Tsunamis are popularly known as tidal waves. But they have nothing to do with tides.
  • These are called so because they look like high tides.
  • Large amount of water move at a great speed in tidal waves.
  • Speed may reach up to 800km/hr.
  • When water reaches the land with such a great speed it turns into gigantic waves.
  • These waves cause great destruction to life and property.
  • 2004, the tsunami was caused by an earthquake in the indian ocean.
  • Almost 2 lakh people died in India Srilanka and Indonesia.
tidalwaves
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