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Conclusion

A cumulonimbus cloud results when it grows to a height of 10 to 20 kilometres. Thunderstorms are produced by cumulonimbus clouds.

Warm air rises. Cold air sinks.

Just like convection currents, the denser, colder air sinks closer to the ground while the warmer, less dense air rises towards the sky.

Upon further uplifting, the cloud will extend higher. Water droplets get larger.

The warmer, surface air eventually cools off.

Warm air and the moisture in the air condense to form cloud.

Because the convectional atmospheric currents force the denser air down, the warm air would eventually cool off and sink down when the cooler air would heat up and rise.

Unstable air and moisture

Are the beginning components to a thunderstorm.

Heat transfer from the land surface to upper levels of the atmosphere

through the convection currents, the land or water heat/cool the air

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