Educational worksheet exploring the main types of rocks—igneous, sedimentary, and metamorphic—and how they reveal Earth's formation history.

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What are the main types of rocks on our Earth?

What is the difference between igneous, sedimentary, and metamorphic rocks?

#### What do rocks tell us about the way the Earth was formed?

| Image | What do I already know about rocks? | What I would like to find out about rocks? |
|-------|--------------------------------------|---------------------------------------------|
| 1. Mushroom-shaped rock (e.g., hoodoo) | These rocks are often made of sandstone, which is a sedimentary rock. They form when softer layers erode faster than harder ones, creating unique shapes. | How do these formations develop over time? Why are some rocks more resistant to erosion than others? |
| 2. Layered rock formation (e.g., sedimentary layers) | These stacked layers suggest that sediments were deposited over time. The layers may contain fossils and indicate ancient environments like oceans or deserts. | How do scientists use these layers to determine Earth’s history? Can we see climate changes in the rock layers? |
| 3. Columnar basalt (e.g., Devil’s Tower) | This rock has a column-like structure, which forms when lava cools slowly and contracts. It’s likely igneous rock from volcanic activity. | How does lava cooling create these patterns? What kind of volcano created this rock? |
| 4. Wavy red sandstone (e.g., Antelope Canyon) | This smooth, wavy rock is likely sandstone shaped by water erosion. Its color comes from iron oxide (rust). | How did water carve such detailed patterns? What conditions led to the deposition of so much sand? |

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🔍 Explanation of Rock Types:

1. Igneous Rocks
- Formed from cooled and solidified magma or lava.
- Examples: Granite (intrusive), Basalt (extrusive).
- Found in volcanic regions or deep underground.

2. Sedimentary Rocks
- Formed from sediments (like sand, silt, clay) that are compacted and cemented over time.
- Often contain fossils and show layering.
- Examples: Sandstone, shale, limestone.

3. Metamorphic Rocks
- Formed when existing rocks are changed by heat, pressure, or chemically active fluids.
- Original rock (protolith) is transformed without melting.
- Examples: Marble (from limestone), Schist (from shale).

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🌍 How Rocks Tell Us About Earth’s Formation:

- Fossils in sedimentary rocks reveal past life and environments.
- Layering shows the sequence of events over millions of years.
- Igneous rocks indicate volcanic activity and plate tectonics.
- Metamorphic rocks suggest intense geological forces like mountain building.
- Rock composition and texture help scientists reconstruct Earth’s history, including climate changes, sea levels, and continental drift.

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✔ Summary:

Rocks are like Earth’s "diary." By studying them, scientists learn about:
- Ancient climates
- Plate tectonics
- Volcanic activity
- Erosion and deposition processes
- The evolution of life

This worksheet encourages inquiry-based learning—students reflect on what they know and what they want to discover, promoting deeper engagement with geology.

Let me know if you'd like a printable version or want to turn this into a classroom activity!