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Igneous Rock Properties
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Igneous Rock Properties
🌋 Part 1: Understanding Igneous Rock Formation
1. What are igneous rocks formed from?
Sediments compressed together
Cooled and crystallised molten material
Rocks changed by heat and pressure
Weathered rock fragments
2. Which cooling process produces rocks with large crystals?
Very rapid cooling at the surface
Slow cooling deep underground
Cooling in water
Cooling in air
3. Obsidian has a glassy texture because:
It cooled very slowly
It cooled extremely rapidly
It contains lots of gas bubbles
It formed deep underground
4. Which of these are examples of igneous rocks? (Select all that apply)
Granite
Limestone
Basalt
Sandstone
Pumice
🔍 Part 2: Rock Properties and Texture
5. Complete the sentences about igneous rock textures:
Rocks that cool slowly underground have _____________ crystals and are called _____________ rocks.
Rocks that cool quickly on the surface have _____________ crystals and are called _____________ rocks.
6. Explain why granite has larger crystals than basalt:
7. Describe two ways that igneous rocks are useful to humans:
1. ___________________________________________
2. ___________________________________________
8. Match each rock property to its description by drawing lines:
Coarse-grained
Fine-grained
Glassy texture
Vesicular texture
Contains gas bubble holes
Crystals visible to naked eye
No visible crystals
Crystals too small to see
🎯 Part 3: Application and Analysis
9. A geologist finds a dark-coloured igneous rock with very small crystals. Where did this rock most likely form?
10. Explain how the cooling rate of magma affects crystal size in igneous rocks:
Extension Activity: Research and describe one way that First Nations Australians have traditionally used igneous rocks:
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