Clouds are formed when 1.sunlight causes water droplets to evaporate
2.liquid water condenses on grass and windows.
3.raindrops freeze into tiny pellets and fall to earth.
4.water vapor in the air condenses to form liquid water or ice.

D. Water vapor in the air condenses to form liquid water or ice

Explanation:

took test on e2020

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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the answers would be

the first one and the second one