SCIENTISTS AND THEIR INVENTIONS:

1. Thomas Alva Edison

Born on: 11th February, 1847

Died: October 18, 1931

Invented: Electric Bulb

Invention made on: October 22, 1879

Use of invention: Electric bulb is used everywhere to light our homes, hospitals, railway stations, schools, office etc.

2. Alexander Graham Bell

Born on: March 3, 1847

Died: August 2, 1922

Invented: Telephone

Invention made on: March 10, 1876

Use of invention: Telephone helps us to communicate with people at far and near distances. It is one of the fastest means of communication.

3. Charles Babbage

Born on:  26 December 1791

Died: 18 October 1871

Invented: Mechanical Computer

Invention made on: 1822

Use of invention: Computer is used to store thousands of information in schools, hospitals, office etc.

4. Wilhelm Conrad Röntgen

Born on: 27 March 1845

Died: – 10 February 1923

Invented: X - ray

Invention made on: 1895

Use of invention: X ray is widely used in medical science to detect fractured bones in human body.

Science Project:

How an earthquake occurs?

Ans: Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. The spot underground where the rock breaks is called the focus of the earthquake. The place right above the focus (on top of the ground) is called the epicenter of the earthquake.

What is Seismograph?

Ans: Seismograph is an instrument that makes a record of seismic waves caused by an earthquake.

MAJOR EARTHQUAKES IN INDIA:

1. September 30, 1993: Occurred at Latur, Maharashtra. Magnitude of earthquake was 6.2 . Loss of lives of 9,748 people.

2. January 26, 2001: Occurred at Gujarat. Magnitude of earthquake was 7.7 . Loss of lives of 20,000 people.

3. December 26, 2004: Occurred at off west coast northern Sumatra India Sri Lanka Maldives. Magnitude of earthquake was 9.1 . Loss of lives of 283,106 people.

4. October 8, 2005: Occurred at Kashmir. Magnitude of earthquake was 7.6 . Loss of lives of 130,000 people.

EFFECTS OF EARTHQUAKE:

Loss of lives, destruction of property, landslides, floods, tsunamis, soil erosion.