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

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

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

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

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

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

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

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