Thank you for your thoughtful questions, AlterEgo.
1) Electromagnetic radiation is the phenomenon of energy moving through space in waves. Examples of electromagnetic radiation include visible light.
2) A molecule is a group of atoms. An atom is the smallest possible quantity of a substance. When two or more atoms form chemical bonds, the result is a molecule. They are very small, and most items are made up of many molecules.
3) Friction is the force generated when two or more items in contact move against each other. An example of friction is two sticks being rubbed together to generate heat, resulting in a fire.
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1) Electromagnetic radiation is the phenomenon of energy moving through space in waves. Examples of electromagnetic radiation include visible light.
2) A molecule is a group of atoms. An atom is the smallest possible quantity of a substance. When two or more atoms form chemical bonds, the result is a molecule. They are very small, and most items are made up of many molecules.
3) Friction is the force generated when two or more items in contact move against each other. An example of friction is two sticks being rubbed together to generate heat, resulting in a fire.