Open the Earth and space strand with footage of an eruption or earthquake aftermath. Pose: "The ground feels solid and still — but Earth's surface is constantly being reshaped. How?"
Model Earth's structure simply: a thin, brittle crust broken into giant plates that float on hot, slow-moving rock beneath. Where plates meet, they grind, pull apart, or push together — and that movement causes earthquakes and volcanic eruptions.
Use this cross-section to think aloud about how a volcano works — magma collects in a chamber, rises through the vent under pressure, and erupts, building new land from cooled lava:
Introduce geological event (a natural event that changes Earth's surface) and erosion (the wearing away and moving of rock and soil). Stress that these events both build (new volcanic land) and wear down (landslides, cracks) the surface.
In groups, students build a layered model with playdough/clay to represent Earth's crust and the rock beneath. Guide them to:
- press two "plates" together and observe buckling (mountain building, earthquakes);
- push clay up through a hole to model magma rising through a vent.
Then display the world plate-boundary map and ask the class: "What do you notice about where earthquakes and volcanoes happen?" Draw out that they cluster along plate boundaries.
For each event type, co-construct one sentence on how it changes the surface — e.g. "An eruption adds new rock and ash; an earthquake can crack and shift the ground."
Students complete the labelling worksheet:
- label a volcano diagram (crust, magma chamber, vent) — they can use the cross-section above as a guide;
- write one sentence explaining what causes an earthquake and one for a volcanic eruption;
- describe one way each event changes the Earth's surface.
Think-pair-share to close: name one way the surface changed after a geological event you saw today.