Question

Which of the following statement is correct regarding the asteroid impact theory?

• A. Moonlight falls on the earth's surface due to which a thin layer of metal is formed.
• B. Comets struck the surface of earth.
• C. Ultraviolet rays depleted the top layer of atmosphere.
• D. Harmful gases are emitted by vehicles which causes various diseases

Answer 1

The correct option is B

Comets struck the surface of earth.

Asteroid impact theory is used to explain the extinction of animals. In this theory it is believed that comets or asteroids struck on the surface of earth due to which iridium metal got scattered all over the world. Researchers found a layer of iridium metal on the surface of earth, dating 65 million years ago. This layer of metal is not found on the surface of earth, it is found on the surface of comets and meteors. So it is said that asteroids or comets might have struck the surface of earth and the iridium metals would have scattered all over the world.