A tsunami is like when a big wave suddenly appears in the ocean and crashes onto the shore, but it’s caused by something really powerful underneath the water.
Imagine you're playing with your toy boat in the bathtub. If you suddenly knock over a big block next to the tub, it will send a huge splash all the way across the water. That's kind of what happens with tsunamis!
What Causes a Tsunami
A tsunami starts when something really heavy and sudden moves under the ocean, like an earthquake or a volcano erupting.
Think of the ocean as a giant, deep bath. If the floor of that bath suddenly shifts or jumps, just like you knocking over your block, it sends out waves that can travel across the whole ocean, growing bigger and stronger until they reach the shore.
How It Reaches the Shore
When those big waves get closer to land, they become taller and faster. That’s why a small wave in the deep ocean becomes a huge wall of water when it hits the beach, like your little toy boat suddenly getting hit by a tsunami from the other side of the tub!
Examples
- Imagine dropping a rock into a pond, it makes ripples, and tsunamis are like super-sized ripples.
- An underwater volcano explodes, sending waves crashing onto nearby shores.
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See also
- What are underwater earthquakes?
- How do Ocean Waves Work?
- How do earthquakes end a seismic stop sign could help predict earthquake risk?
- How Do Earthquakes Actually Happen?
- How Does 5 Largest Tsunami Waves in All History Work?