What do these two changes have in common?
carving a piece of wood
butter melting on a hot day

 - Both are chemical changes.
 - Both are only physical changes.
 - Both are caused by heating.
 - Both are caused by cooling.
Step 1: Think about each change.
Carving a piece of wood is a physical change. The wood changes shape, but it is still made of the same type of matter.
Butter melting on a hot day is a change of state. So, it is a physical change. The butter changes from solid to liquid, but it is still made of the same type of matter.
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.
Butter melting on a hot day is caused by heating. But carving a piece of wood is not.
Both are caused by cooling.
Neither change is caused by cooling.