What do these two changes have in common?
a crayon melting in the sun
a puddle freezing into ice on a cold night

 - Both are caused by cooling.
 - Both are only physical changes.
 - Both are chemical changes.
 - Both are caused by heating.
Step 1: Think about each change.
A crayon melting in the sun is a change of state. So, it is a physical change. The crayon changes state from solid to liquid. The crayon is still made of wax, even after it melts.
A puddle freezing into ice on a cold night is a change of state. So, it is a physical change. Liquid water freezes and becomes solid, but it is still made of water. A different type of matter is not formed.
Step 2: Look at each answer choice.
Both are only physical changes.
Both changes are physical changes. No new matter is created.
Both are chemical changes.
Both changes are physical changes. They are not chemical changes.
Both are caused by heating.
A crayon melting in the sun is caused by heating. But a puddle freezing is not.
Both are caused by cooling.
A puddle freezing is caused by cooling. But a crayon melting is not.