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

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

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

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

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

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

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

A) false
B) true

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

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