When two blocks of the Earth slip past each other suddenly, that’s what we call an earthquake! From a physics point of view, earthquakes are a release of the elastic potential energy that builds up. Most energy is released as heat, not as shaking, during an earthquake. 90% of all earthquakes happen along the Ring of Fire, which is the active zone that surrounds the Pacific Ocean.

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5 Responses to “Earthquakes!”

  1. Some kinds of lava do actually have some natural radioactivity. Granite – which is formed when magma cools – can contain radioactive elements such as potassium, uranium, and thorium in higher concentrations that the rest of Earth’s crust. This natural radiation isn’t dangerous.

  2. Melanie Williamson says:

    why isn’t lava radioactive if it touches a radioactive iron core?-Gabe williamson

  3. There are four links after the last paragraphs of explanation under the video – do you see them?

  4. Megan Goebel says:

    where is the seismograph work sheet for this video?

  5. Michelle Stevens says:

    What are the other kinds of rock that give off a voltage when you smack them with a sledge hammer?