Fossils are something left from a plant or an animal that lived long time ago that have turned into a rock. Many of fossils are things that now is extinct. Extinct means a living thing’s kind is no longer alive today. For example, dinosaurs are extinct.
Fossils are form when a living things dies. It gets covered by sediment. For example, like mud, sand, soil, or clay. After a long time, soft pats decompose. Decompose means it breaks down. Then, the harder parts stay. After that, more layers of sediments pile up. So, it gets heavier as more sediments pile on. Since it got heavy, sediments presses down, so it creates a lot of pressure. Then, the lower layers turn into rocks. Water can sip through and create minerals. After many years, layers of rock slowly wash away. So then, fossils can be found. But sometimes, the living creatures can form into fossils in other ways. For example, there can be prints on rocks, get frozen in an ice, or get trapped in a tree sap. Fossils can give us clues about what happened or what was it like long time ago.
We made our own fossils. First, we had to put some clay at the bottom of a cup. Then, we made a print with a shell on the clay. After few days, we pour a little bit of liquid in that cup. After another few days, it got hard. So, we took out our fossils. But mine had broke, so I had to do it again. Next time I do this experiment, I will be very careful.
I learned from this fossil unit, that fossils can form in different ways, that some body parts from a fossil can give clues like what did that thing ate, what kind of place it live and so on. This fossil unit taught me a lot of things.

This is my fossil!

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