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

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

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

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

A) true
B) false

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

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