Pure substances can be elements made up exclusively of one kind of atom, or they can be compounds made up of molecules that include two or more elements. Mixtures can be homogeneous or heterogeneous depending on how finely mixed the components are.
The neutrons are inside the nucleus, have no charge, and have mass.
Answer:
Friction is a force that opposes motion.
A warmer climate is produced because of the gulf stream which begins at the tip of Florida and flows up all the way to NW Europe.
In order to design an experiment, you need a hypothesis about the scientific question you are trying to answer.
