Earthquakes An earthquake is a sudden shaking of the ground. It happens because huge masses of rock move, collide or slide past each other beneath the Earth's surface. These rock masses are called plates and make up the Earth's crust. When the plates move, it creates pressure that may cause a sudden shift along a crack in the crust. The moving rocks release energy which may cause an earthquake. Earthquakes may have a different level of intensity. The instrument that measures the energy of the shock waves is called a seismograph. The Richter scale measures the size of earthquakes. The microearthquakes that people cannot even feel are measured by less than 2 points on the scale, while the strongest earthquakes, when heavy objects are thrown into the air and cracks appear on the ground, are closer to 8 or 9. However, there were no such quakes that could be measured by the highest value of 10. The Mercalli scale tells about the effects and the destruction earthquakes cause. The values range from I, Instrumental, to XII, Catastrophic. Earthquakes can be violent. They may cause a lot of damage: destroy buildings, railroads and kill people. Sudden quakes may be the reason for other natural disasters such as avalanches or tsunamis. Sometimes human activity such as the digging of mines or underground explosions may trigger an earthquake. An earthquake is caused by the shifting of rock plates the Earth's pressure the crack in the crust A seismograph is used to record the pressure of an earthquake to measure seismic waves to listen to an earthquake The strongest quake is an earthquake that is measured by the middle value of the Richter scale causes cracks in the ground causes little damage The Mercalli scale records the ranges from I to XII the size of an earthquake the amount of damage an earthquake causes The negative consequences of an earthquake are tsunamis and tornadoes underground explosions destroyed property and human deaths
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Earthquakes

An earthquake is a sudden shaking of the ground. It happens because huge masses of rock move, collide or slide past each other beneath the Earth's surface. These rock masses are called plates and make up the Earth's crust. When the plates move, it creates pressure that may cause a sudden shift along a crack in the crust. The moving rocks release energy which may cause an earthquake.

Earthquakes may have a different level of intensity. The instrument that measures the energy of the shock waves is called a seismograph. The Richter scale measures the size of earthquakes. The microearthquakes that people cannot even feel are measured by less than 2 points on the scale, while the strongest earthquakes, when heavy objects are thrown into the air and cracks appear on the ground, are closer to 8 or 9. However, there were no such quakes that could be measured by the highest value of 10. The Mercalli scale tells about the effects and the destruction earthquakes cause. The values range from I, Instrumental, to XII, Catastrophic.

Earthquakes can be violent. They may cause a lot of damage: destroy buildings, railroads and kill people. Sudden quakes may be the reason for other natural disasters such as avalanches or tsunamis.

Sometimes human activity such as the digging of mines or underground explosions may trigger an earthquake.

An earthquake is caused by

  • the shifting of rock plates
  • the Earth's pressure
  • the crack in the crust

A seismograph is used

  • to record the pressure of an earthquake
  • to measure seismic waves
  • to listen to an earthquake

The strongest quake is an earthquake that

  • is measured by the middle value of the Richter scale
  • causes cracks in the ground
  • causes little damage

The Mercalli scale records

  • the ranges from I to XII
  • the size of an earthquake
  • the amount of damage an earthquake causes

The negative consequences of an earthquake are

  • tsunamis and tornadoes
  • underground explosions
  • destroyed property and human deaths

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