What do these two changes have in common?
molding clay into the shape of a pot
breaking a stick in half

 - Both are caused by heating.
 - Both are chemical changes.
 - Both are caused by cooling.
 - 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.
Breaking a stick in half is a physical change. The stick gets broken into two pieces. But the pieces are still made of the same type of matter as the original stick.
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.