What do these two changes have in common?
cooking an egg
an iceberg melting slowly

 - Both are chemical changes.
 - Both are only physical changes.
 - Both are caused by cooling.
 - Both are caused by heating.
Step 1: Think about each change.
Cooking an egg is a chemical change. The heat causes the matter in the egg to change. Cooked eggs and raw eggs are made of different types of matter.
An iceberg melting is a change of state. So, it is a physical change. An iceberg is made of frozen water. As it melts, the water changes from a solid to a liquid. But a different type of matter is not formed.
Step 2: Look at each answer choice.
Both are only physical changes.
An iceberg melting is a physical change. But cooking an egg is not.
Both are chemical changes.
Cooking an egg is a chemical change. But an iceberg melting is not.
Both are caused by heating.
Both changes are caused by heating.
Both are caused by cooling.
Neither change is caused by cooling.