Metamorphic rock
I can describe how rock can be changed deep underground.
Metamorphic rock
I can describe how rock can be changed deep underground.
Lesson details
Key learning points
- In a crystal, the atoms are all arranged in a very regular pattern.
- In some substances, very high pressure, at a high temperature, can push particles together to form crystals.
- Between tectonic plates, the pressure and temperature are high enough for large crystals to grow inside solid rock.
- Metamorphic rocks form under extreme pressure and temperature, altering original structures.
- Aligned crystals in metamorphic rocks give them useful properties (e.g. decoration or easily separated into sheets).
Common misconception
Pressure and heating caused by burying alone is enough to cause metamorphism or rock to melt.
Highlight that the temperatures / pressures needed for metamorphism or rocks to melt are typically found at plate boundaries / hot spots.
Keywords
Pressure - The effect of a force acting over an area.
Metamorphic rock - Rocks that have changed due to heat and/or pressure (e.g. marble, slate).
Aligned - Grains that line up in the same direction are described as aligned.
Equipment
Toothpicks (could use matchsticks), rulers ×2; plasticine, stirring rods (optional: shells).
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
the thick, solid layer beneath the crust
the central part of Earth
the outermost layer of Earth