Lightning bolts are caused by what phenomenon?

Lightning bolts are caused by what phenomenon?

• A. Dielectric breakdown between clouds and ground
• B. Ocean currents
• C. Magnetic storms
• D. Static friction

Answer: (A)

Lightning is an electric discharge that happens when air, normally a strong insulator, becomes conductive under a very strong electric field. In a thundercloud, charges separate so that the lower part is mostly negative and the upper part is more positive, creating a large potential difference with the ground. When the electric field between the cloud and the ground becomes strong enough, air undergoes dielectric breakdown and ionizes, turning into a plasma that conducts electricity. This rapid discharge follows a path through the air—often starting with a stepped leader and culminating in the main flash—which heats the air to extreme temperatures and produces the visible bolt and the accompanying thunder. Other options don’t describe what enables the spark to travel through air. Ocean currents aren’t the cause of the electric potential between cloud and ground, magnetic storms involve magnetic activity related to planetary and solar processes, and static friction is just one way charges can build up, not the process that creates the sudden breakdown and discharge of air itself.

Lightning is an electric discharge that happens when air, normally a strong insulator, becomes conductive under a very strong electric field. In a thundercloud, charges separate so that the lower part is mostly negative and the upper part is more positive, creating a large potential difference with the ground. When the electric field between the cloud and the ground becomes strong enough, air undergoes dielectric breakdown and ionizes, turning into a plasma that conducts electricity. This rapid discharge follows a path through the air—often starting with a stepped leader and culminating in the main flash—which heats the air to extreme temperatures and produces the visible bolt and the accompanying thunder.

Other options don’t describe what enables the spark to travel through air. Ocean currents aren’t the cause of the electric potential between cloud and ground, magnetic storms involve magnetic activity related to planetary and solar processes, and static friction is just one way charges can build up, not the process that creates the sudden breakdown and discharge of air itself.