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

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

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

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

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

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

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

A) true
B) false

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

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