What do these two changes have in common?
molding clay into the shape of a pot
a rock heating up in a campfire

 - Both are caused by cooling.
 - Both are caused by heating.
 - Both are chemical changes.
 - Both are only physical changes.
Step 1: Think about each change.
Molding clay into the shape of a pot is a physical change. The clay gets a different shape. But it is made of the same type of matter.
A rock heating up in a campfire is a physical change. The temperature of the rock goes up, but the rock 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.
A rock heating up in a campfire is caused by heating. But molding clay is not.
Both are caused by cooling.
Neither change is caused by cooling.