The word 'epicentre' is used to describe

Correct option is C

​The correct answer is (c) Earthquake

Explanation:

The term ‘epicentre’ refers to the point on the Earth’s surface that is directly above the focus (hypocentre) of an earthquake. It is the location where the seismic waves reach first and usually where the intensity of shaking is the strongest.

• The focus (hypocentre) is the actual point within the Earth where the earthquake originates.
• The epicentre helps determine the areas most affected during an earthquake.

Information Booster:

• Earthquakes release energy in the form of seismic waves.
• These waves are recorded by seismographs, which help scientists locate the epicentre and magnitude.
• The Richter scale or Moment Magnitude Scale (Mw) is used to measure the magnitude of earthquakes.
• Areas near the epicentre experience the most damage depending on depth and magnitude.
• The earthquakes are divided into three zones: shallow, intermediate, and deep based on their depth, which ranges between 0 – 700 km.

1. Shallow earthquakes have a focus 0 – 70 km deep.
2. Intermediate earthquakes have a focus 70 – 300 km deep.
3. Deep earthquakes have a focus 300 – 700 km deep.

Additional Knowledge:

• Marine waves: These are regular waves formed by the wind blowing over the surface of the sea.
• Tsunami: A tsunami is a series of large sea waves caused by underwater earthquakes, volcanic eruptions, or landslides.
• Glacier: A glacier is a mass of dense ice that moves slowly over land.