Educational worksheet on types of fossils with matching activity for students.

Let's solve this step-by-step based on the information provided in the worksheet.

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Understanding the Task

We are given a chart with three columns:
1. Type of Fossil
2. How the Fossil Formed
3. Photo Example of the Fossil

We must match the information cards (at the bottom) to the correct rows in the chart. The cards include:
- "Trace Fossil"
- "Mold Fossil"
- A photo of a fossilized object (likely a mold)
- A photo of another fossil (likely a cast)
- Description: "a fossilized, hollow impression of a plant or animal"
- Description: "forms when a mold is filled in with sediment"
- Description: "nests, eggs, tracks, coprolites (dinosaur poop) that have been fossilized"

We already have one row filled:
- Cast Fossil in the first row

We need to complete the rest by matching the correct type, formation process, and photo.

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Step 1: Identify the Types of Fossils

There are three main types we're working with:
1. Cast Fossil
2. Mold Fossil
3. Trace Fossil

We already have "Cast Fossil" in the first row.

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Step 2: Match Definitions

Let’s analyze each description:

#### "a fossilized, hollow impression of a plant or animal"
- This describes a mold fossil — it's an impression left behind after the original organism decays.
- So this goes under Mold Fossil.

#### "forms when a mold is filled in with sediment"
- This describes how a cast fossil forms.
- After a mold is made, sediment fills it and hardens, forming a cast.
- So this goes under Cast Fossil.

#### "nests, eggs, tracks, coprolites (dinosaur poop) that have been fossilized"
- These are trace fossils — evidence of activity, not the actual body.
- So this goes under Trace Fossil.

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Step 3: Match Photos

Now look at the photos:
1. Top photo: Shows a rock with a hollow impression (like a shell shape).
- This is a mold fossil — a hollow impression.
2. Bottom photo: Shows a solid, 3D object resembling a shell.
- This is a cast fossil — formed when sediment fills a mold.

So:
- Mold Fossil → top photo
- Cast Fossil → bottom photo
- Trace Fossil → no photo shown, but the description includes nests, eggs, etc., so we’ll use the text.

Wait — actually, looking back at the image, the photo example for Cast Fossil is already missing, but the bottom photo (the gray rock) is likely meant for Cast Fossil, and the top photo (yellowish, hollow) is for Mold Fossil.

But let's double-check:

- The first row has "Cast Fossil" as the type.
- The third row has a photo (gray rock), which looks like a solid cast.
- The second row has the description: "a fossilized, hollow impression..." — that’s a mold.

So:
- Row 1: Cast Fossil
- Row 2: Mold Fossil (because it has the mold definition)
- Row 3: Trace Fossil (only one left)

But wait — the photo in the third row is not a trace fossil. It’s a solid object.

Let’s re-express the chart:

| Type of Fossil | How the Fossil Formed | Photo Example |
|----------------|------------------------|---------------|
| Cast Fossil | ? | ? |
| ? | a fossilized, hollow impression... | ? |
| ? | ? | [gray rock] |

And below are cut-out cards:
- "Trace Fossil"
- "Mold Fossil"
- "forms when a mold is filled in with sediment"
- "nests, eggs, tracks, coprolites..."
- Two photos: one yellow (hollow-looking), one gray (solid)

So let’s assign:

Row 1: Cast Fossil

- How it formed: "forms when a mold is filled in with sediment"
- Photo Example: The gray rock (solid cast)

Row 2: Mold Fossil

- Type: "Mold Fossil"
- How it formed: "a fossilized, hollow impression of a plant or animal"
- Photo Example: The yellowish, hollow-looking fossil

Row 3: Trace Fossil

- Type: "Trace Fossil"
- How it formed: "nests, eggs, tracks, coprolites (dinosaur poop) that have been fossilized"
- Photo Example: None shown, but perhaps implied?

Wait — in the image, the third row already has a photo (gray rock). But we just assigned that to Cast Fossil.

Ah! There’s a problem: the photo in the third row is already placed.

Looking carefully:
- The third row has a photo (gray rock) in the "Photo Example" column.
- The second row has the description: "a fossilized, hollow impression..." in the "How the Fossil Formed" column.
- The first row has "Cast Fossil" in the "Type of Fossil" column.

So we need to fill in the missing parts.

Let’s reconstruct the full chart correctly.

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✔ Correct Assignment:

#### Row 1: Cast Fossil
- Type of Fossil: Cast Fossil (given)
- How the Fossil Formed: "forms when a mold is filled in with sediment"
- Photo Example: The gray rock (solid, 3D fossil — a cast)

#### Row 2: Mold Fossil
- Type of Fossil: Mold Fossil
- How the Fossil Formed: "a fossilized, hollow impression of a plant or animal"
- Photo Example: The yellowish, hollow-looking fossil (impression)

#### Row 3: Trace Fossil
- Type of Fossil: Trace Fossil
- How the Fossil Formed: "nests, eggs, tracks, coprolites (dinosaur poop) that have been fossilized"
- Photo Example: None shown — but perhaps the worksheet assumes you'll paste one from elsewhere? Or maybe the photo in row 3 is not a trace fossil?

Wait — the photo in row 3 is the gray rock, which we’ve assigned to Cast Fossil.

But in the image, the photo is in row 3, and it’s already there.

So the current layout is:

| Type of Fossil | How the Fossil Formed | Photo Example |
|----------------|------------------------|---------------|
| Cast Fossil | | |
| | a fossilized, hollow impression... | |
| | | [gray rock] |

So the photo is in row 3, meaning row 3 must be Cast Fossil?

But row 1 already says "Cast Fossil".

This suggests a misalignment.

Wait — perhaps the table is incomplete, and we need to cut and paste the cards into the correct squares.

Let’s assume the table has three rows, and we must assign each card to the correct row.

We have:

- Three types: Cast, Mold, Trace
- Three formation descriptions
- Two photos and one text card

But only one photo is already in the table (in the third row).

Let’s list all cards:

1. "Trace Fossil" (type)
2. "Mold Fossil" (type)
3. "forms when a mold is filled in with sediment" (how formed)
4. "nests, eggs, tracks, coprolites..." (how formed)
5. Photo 1: Yellowish, hollow — likely mold
6. Photo 2: Gray, solid — likely cast

So:

- Cast Fossil → forms when mold is filled with sediment → photo: gray rock
- Mold Fossil → hollow impression → photo: yellow rock
- Trace Fossil → nests, eggs, etc. → no photo provided

Now, in the table:
- Row 1: "Cast Fossil" is already written
- Row 2: has the description "a fossilized, hollow impression..." → that’s Mold Fossil
- Row 3: has a photo (gray rock) → that’s a cast, so should be Cast Fossil

But Cast Fossil is already in row 1.

So the photo in row 3 must belong to Cast Fossil, meaning row 3 should be Cast Fossil.

But row 1 already has "Cast Fossil".

This implies the table is misaligned — probably the "Cast Fossil" label is in the wrong row.

Wait — maybe the "Cast Fossil" is just a placeholder, and we need to move it?

No — the instruction says: "Cut and paste the information cards in the corresponding squares."

So the "Cast Fossil" label is already in the first row — it’s part of the table.

But then the photo in the third row is not a cast fossil? But it looks like one.

Alternatively, maybe the photo in the third row is not a cast fossil — but what is it?

Wait — the photo in the third row shows a rock with a rough texture, possibly a coprolite (fossilized poop) — which is a trace fossil!

Ah! That makes sense.

Let’s reconsider.

Re-evaluating the Photos:

1. Top photo (yellow): Looks like a mold — hollow impression of a shell.
2. Bottom photo (gray): Looks like a coprolite (fossilized feces) — a trace fossil.

So:
- Yellow photo → Mold Fossil
- Gray photo → Trace Fossil

But the gray photo is in row 3, which currently has no type.

Also, row 2 has the description: "a fossilized, hollow impression..." → that’s Mold Fossil

So:

#### Row 1: Cast Fossil
- Type: Cast Fossil (given)
- How formed: "forms when a mold is filled in with sediment"
- Photo: ??? — not yet assigned

But no photo is in row 1.

Row 2:
- Type: Mold Fossil
- How formed: "a fossilized, hollow impression..."
- Photo: ??? — but the yellow photo should go here

Row 3:
- Type: Trace Fossil
- How formed: "nests, eggs, tracks, coprolites..."
- Photo: gray rock — which is a coprolite (trace fossil)

Perfect!

Now, Cast Fossil is in row 1, but it has no photo.

But the yellow photo is a mold, not a cast.

The cast would be if sediment filled the mold — so a solid replica.

But we don’t have a photo of a cast.

Wait — do we?

Look at the cards:
- One photo is yellow, hollow — mold
- One photo is gray, solid — could be cast or coprolite

But coprolite is a trace fossil, not a cast.

So the gray rock is likely a coprolite, hence trace fossil.

Then what about Cast Fossil? We need a photo of a cast.

But none of the photos show a solid cast — both are either hollow or irregular.

Wait — perhaps the yellow photo is actually a cast?

No — it’s clearly hollow.

Maybe the gray rock is a cast?

It could be — but it looks more like a coprolite.

Alternatively, perhaps the gray rock is a cast of a shell, and the yellow is a mold.

But the gray rock doesn't look like a shell — it’s irregular.

Given that the description for Trace Fossil is "nests, eggs, tracks, coprolites", and coprolites are often small, irregular rocks, the gray rock is most likely a coprolite.

Therefore:

Final Assignments:

| Type of Fossil | How the Fossil Formed | Photo Example |
|----------------|------------------------|---------------|
| Cast Fossil | forms when a mold is filled in with sediment | ??? (none provided) |
| Mold Fossil | a fossilized, hollow impression of a plant or animal | yellow photo |
| Trace Fossil | nests, eggs, tracks, coprolites (dinosaur poop) that have been fossilized | gray photo |

But now Cast Fossil has no photo — but we have two photos.

Wait — the yellow photo is a mold, so it goes with Mold Fossil.

The gray photo is a trace fossil (coprolite), so it goes with Trace Fossil.

So Cast Fossil has no photo — but the worksheet may expect us to place the correct cards.

But in the image, the photo in row 3 is already present — so we must assign it.

Thus, row 3 must be Trace Fossil, with the gray photo.

Row 2 has the description "a fossilized, hollow impression..." → Mold Fossil, so we paste "Mold Fossil" in the Type column.

Row 1 has "Cast Fossil" → we paste "forms when a mold is filled in with sediment" in the How it formed column.

Now, the photos:
- The yellow photo (hollow) → goes with Mold Fossil → row 2
- The gray photo (irregular) → goes with Trace Fossil → row 3

But in the image, the gray photo is already in row 3, so that’s fine.

The yellow photo is not yet placed — it should go in row 2.

So the final completed chart is:

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✔ Completed Chart:

| Type of Fossil | How the Fossil Formed | Photo Example |
|----------------|------------------------|---------------|
| Cast Fossil | forms when a mold is filled in with sediment | [no photo provided] |
| Mold Fossil | a fossilized, hollow impression of a plant or animal | [yellow photo] |
| Trace Fossil | nests, eggs, tracks, coprolites (dinosaur poop) that have been fossilized | [gray photo] |

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Summary of Matching:

- Cast Fossil → formed when mold is filled with sediment
- Mold Fossil → hollow impression
- Trace Fossil → evidence of activity (tracks, poop, etc.)

Photos:
- Yellow (hollow): Mold Fossil
- Gray (irregular): Trace Fossil (coprolite)

Even though the Cast Fossil has no photo, the others are matched correctly.

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✔ Final Answer:

Completed Table:

| Type of Fossil | How the Fossil Formed | Photo Example |
|----------------|------------------------|---------------|
| Cast Fossil | forms when a mold is filled in with sediment | (none) |
| Mold Fossil | a fossilized, hollow impression of a plant or animal | [yellow photo] |
| Trace Fossil | nests, eggs, tracks, coprolites (dinosaur poop) that have been fossilized | [gray photo] |

> Explanation:
> - Cast Fossil: Forms when sediment fills a mold and hardens, creating a 3D replica.
> - Mold Fossil: A hollow impression left in rock after an organism decays.
> - Trace Fossil: Evidence of an organism’s activity (e.g., footprints, poop).

The photos are matched accordingly: the yellow one is a mold (hollow), the gray one is a trace fossil (coprolite).