What is thunder? Md. Saifur Rahman The loud noise that occurs during lightning from the contraction and expansion of the atmospheric pressure around the clouds is called thunder. You may likeDo I need car insurance?What is car insurance?How could I get cheaper car insurance?What is auto insurance?Why Adulterant food is the barrier to sound health?What are the producers?What are food preservatives?What is food chain?What is tertiary consumer?