A) liquid
B) light
C) motion
D) energy

A) changes in the state of matter
B) vibrating objects
C) thinking about objects
D) energy changing form

A) empty space
B) solid objects
C) water
D) matter

A) solids
B) liquids
C) gels
D) gases

A) a block of iron
B) empty space
C) a mixture of gases
D) a pool of water

A) waves
B) circular motions
C) empty space
D) straight lines

A) see
B) feel
C) hear
D) speak

A) false
B) true

A) the substance that does not allow electricity to travel through it
B) a form of energy that travels in waves and can move in empty space
C) the amount of matter in an object
D) a form of energy produced by vibrating objects

A) a force that works against motion
B) the measure of the amount of gravity acting on an object's mass
C) move back and forth rapidly
D) a form of energy produced by vibrating objects