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Illustrated cross-section showing snow-capped mountains above an underground subway train in a tunnel, with a drill below.

Illustrated cross-section showing snow-capped mountains above an underground subway train in a tunnel, with a drill below.

The Alps Mountains: Draw two simple connected triangles at the top of your flap.The Ground Line: Draw a straight horizontal line right across the page underneath the mountains. This divides the open air from the underground.The Underground Subway: Underneath that line, draw a long, thick horizontal tube running from the left side to the right side. Inside it, draw a long train rectangle with small windows and circle wheels. (This perfectly covers the Alps railway tunnel and subways from your notes!)The Deep Drill: At the very bottom, draw a vertical line that turns into a small spiral or corkscrew shape 🌀 pointing downwards to represent oil drilling deep into the Earth's subsurface. Mehr sehen