Question

what do these two changes have in common? filtering air to remove dust and pollen crushing a mineral into powder select all that apply. both are caused by cooling. both are changes of state. both are only physical changes. both are chemical changes.

Explanation:

Filtering air to remove dust/pollen and crushing a mineral into powder only alter the physical form or separation of materials, not their chemical composition. They do not involve cooling or changes of state (like solid/liquid/gas transitions), and they are not chemical changes.

Answer:

Both are only physical changes.