Which of the following best describes particles in matter? a. they are larger in solids than in liquids or gases. b.they are larger in gases than in solids or liquids. c.they do not move in solids. d.they are always moving

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas