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

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

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

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

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

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

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

A) false
B) true

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

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