Petrified wood fossil, example of petrification.

Let’s go through each fossil one by one and match it to the correct type.

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First fossil (top image):
It looks like a big, colorful rock that used to be wood — you can see tree rings and bark-like texture. This is when minerals replace the original material of an organism, turning it into stone. That’s called Petrification.

✔ So for the first one: Tick Petrification

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Second fossil:
This is a spiral shell pressed into rock — it’s not the actual shell, but the impression left behind. When an organism leaves a hollow space (mold) or fills that space with sediment (cast), we call that Molds & Casts.

✔ So for the second one: Tick Molds & Casts

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Third fossil:
This is a footprint — maybe from a dinosaur or bird. It’s not part of the animal itself, but evidence that the animal was there. Footprints, burrows, bite marks — these are all Trace fossils.

✔ So for the third one: Tick Trace

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Fourth fossil (bottom image):
You can see dark leaf shapes on light-colored rock. This happens when plant material gets squished and only carbon remains — leaving a thin black film. That’s Carbonization.

✔ So for the fourth one: Tick Carbonization

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Final Answer:
- First fossil → Petrification
- Second fossil → Molds & Casts
- Third fossil → Trace
- Fourth fossil → Carbonization