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The Cracking Crust

This activity will help you understand how the Earth's crust buckles and cracks, letting magma rise to the surface. If you live in a volcanic region or one where the land is very buckled, there are probably hot spots where magma has risen close to the surface and even broken through.

What you need:

Packets of mini Moro Bars

• Unwrap the Moro Bar and hold it at eye level.
• Slowly bend the ends of the bar downwards. (if you live in a cold area you may need to gently warm the bar up in the microwave for 10 seconds to soften it).
• Gently push the ends back upwards, watching carefully what happened to the layer of soft caramel.
• Draw and discuss what happens.
• Relate the chocolate outer layer to the Earth's crust and the caramel to the magma flowing up from under the crust where the plates are shifting apart.
• Eat the Moro Bar!