In an earthquake the ground shakes from side to side. Buildings stay safer when they have a wide, strong base, flexible joints that bend instead of cracking, cross bracing in the walls, steel bars inside the concrete, a light roof and a simple, even shape; some sit on rubber pads that soak up the shaking. Heavy roofs on thin walls, loose bricks, missing steel and heavy tanks high up make buildings less safe. A tall, narrow block tips over more easily than a short, wide one.
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
🏁 Lesson 21 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
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🏚️ Quake Proofer badge when you pass — and a certificate when you finish all 8 lessons of
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