What do these two changes have in common?
carving a piece of wood
picking up a paper clip with a magnet

 - Both are chemical changes.
 - Both are caused by heating.
 - Both are only physical changes.
 - 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.
Picking up a paper clip with a magnet is a physical change. The paper clip sticks to the magnet, 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.
Neither change is caused by heating.
Both are caused by cooling.
Neither change is caused by cooling.