Question

Which of the following statements is INCORRECT?

• A. The process of electric discharge can occur between two clouds.
  
• B. The process of electric discharge cannot occur between clouds and the Earth.
  
• C. Tremors on the Earth can also be caused by the eruption of a volcano.
  
• D. The plates of the outermost layer of the Earth are always in continuous motion.
  

Answer 1

The correct option is B The process of electric discharge cannot occur between clouds and the Earth.


The plates of the outermost layer of the Earth are always in continuous motion:
This is correct, as we know that the crust is in continuous motion but we are unable to detect it due to its slowness.

Tremors on Earth can also be caused by the eruption of a volcano:
This is also a true statement because during a volcanic eruption the Earth’s crust cracks and due to it, we can feel tremors.

The process of electric discharge cannot occur between clouds and Earth:
This is an incorrect statement as we know that the electric discharge between a cloud and the Earth causes lightning and we all have seen lightning sometimes.

The process of electric discharge can occur between two clouds:
This is a correct statement because, a positive charge accumulates at the upper part of a cloud and the negative charge on the lower part of it. The positive charges of one cloud attract the negative charges of another and hence, electric discharge takes place.