Year 5 · first unit
If you see stripes in a cliff, it is a book. The lower lines are long ago, the upper lines later. And fossils are pressed between them.

A flood comes, goes down, and another comes. Run a few years.

Tap a stone to look at it through the magnifying glass, then choose what hardened to make it.

What has to happen for this to become a fossil? There are six stages.
