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

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

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

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

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

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

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

A) true
B) false

A) the amount of matter in an object
B) a form of energy that travels in waves and can move in empty space
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) the measure of the amount of gravity acting on an object's mass
C) a force that works against motion
D) a form of energy produced by vibrating objects