A flight simulator that helps astronauts prepare for a shuttle launch is an example of a Scientific Model.
I think it is not possible to make cd without plastic . because except plastic no other material is so durable for making cd.
Because the Potassium ion loses an electron, the electrons come a little closer to the nucleus because they are attracted to the protons. This makes the ion smaller in radius
last one? don't take my word though
Explanation:
the suns heat is related to nuclear fusion
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