What do these two changes have in common? mixing lettuce and salad dressing crushing a mineral into powder Select all that apply. Both are only physical changes. Both are chemical changes. Both are caused by heating. Both are caused by cooling.

## Step 1<br />The problem presents two scenarios: mixing lettuce and salad dressing, and crushing a mineral into powder. We are asked to identify the commonality between these two changes.<br /><br />## Step 2<br />In the first scenario, mixing lettuce and salad dressing, no new substances are formed. The lettuce and salad dressing are simply mixed together, but their individual properties remain unchanged. This is a characteristic of a physical change.<br /><br />## Step 3<br />In the second scenario, crushing a mineral into powder, the mineral is physically altered, but no new substances are formed. The mineral is simply broken down into smaller pieces, but its inherent properties remain unchanged. This is also a characteristic of a physical change.<br /><br />## Step 4<br />Based on the above analysis, both scenarios involve physical changes, not chemical changes. Therefore, the correct answer is "Both are only physical changes."