You will learn: Heating and cooling can cause changes we can see. Sometimes these changes are reversible and can be changed back. Sometimes these changes are non-reversible and cannot be changed back. For the activity slides, you will: Use your science journal to answer the questions on the first slide. Use the to post a picture of your science journal. On the 2nd slide, click the :link to watch the video. Follow the directions on the 3rd slide. Use the to post a picture of your science journal. Do the experiment yourself on slide 4 if you want! Use the to post a video of you doing the experiment. Remember this is optional and you can only do it if your parents give you permission. Click the green to turn in the activity.