Mon Prof Augmenté
Seafloor Break Lifts the Sea
Age 11 · Science
Deep under the ocean, a fault in the rocky floor can slip in an instant. One block of rock jerks upward, shoving a huge amount of water up and sending waves racing outward across the surface.
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Age 11: open this week
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In the picture
- Crack in the seabed rock where the two blocks meet
- Rock block thrust upward above the other
- Mound of water pushed up above the raised rock
- Wave crests spreading outward across the surface
Examples
- Dropping a big stone into a pond makes rings of ripples spread to the shore.
- Jumping into a swimming pool pushes water outward in waves that slap the walls.
Key takeaways
- A tsunami starts when the seafloor moves and lifts the water above it.
- Out at sea the waves are low and far apart, but they grow tall near the shore.
Quiz: Seafloor Break Lifts the Sea (Age 11)
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What starts a tsunami?
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What happens to tsunami waves as they move from the open ocean toward the shore?
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In a tsunami caused by an undersea earthquake, what pushes the water upward?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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