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

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

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

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

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

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

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

A) false
B) true

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 form of energy produced by vibrating objects
D) a force that works against motion