| A | B |
|---|
| What do a rock and a dog have in common? | They are made of matter. |
| anything that takes up space and has weight | matter |
| a measure of how much matter an object has | mass |
| where gravity is the strongest | center of the earth |
| What is gravity? | a force |
| weight | pull that gravity has on an object |
| four states of matter | solid, liquid, gas, plasma |
| heat makes water do this | evaporate |
| A liquid takes the shape of its | container |
| a positive electric charge | protons |
| a negative electric charge | electrons |
| no electric charge | neutrons |
| made of protons and neutrons | nucleus |
| atoms | made of protons and neutrons |
| different kinds of atoms | different number of particles |
