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In the proton- proton chain, helium atoms are fused into hydrogen.
Troposphere
The lowest layer of Earth’s atmosphere, where weather occurs and the majority of airborne pollutants are concentrated.
Hot Air Balloon
is a lighter-than-air aircraft consisting of a bag, known as an envelope, which contains heated air that provides lift, allowing it to float in the atmosphere.
Fly
An insect of the order Diptera, known for its ability to fly and its role in various ecological processes such as pollination and decomposing organic matter.
Atmosphere
The layer of gases surrounding Earth, protecting it from extreme temperatures and harmful space energies.
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