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| Scientists study earthquakes to learn more about the ____________. |
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| An earthquake is a ________________ in the Earth. |
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| An earthquake is caused by the release of _______________ in the Earth's outer layer. |
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| Scientists use an instrument called a _______________ to measure seismic waves. |
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| Seicmic waves are _____________ caused by rocks omving and breaking along faults. |
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| Primary waves are also known as ____________. |
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| These waves are the fastest waves and are the first to arrive at a distant point. |
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| Primary waves travel through ________________. |
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| solids, liquids, and gases |
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| Secondary waves are also known as _____________. |
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| _______________ travel slower than P waves and arrive later at a distant point. |
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| Secondary waves can travel through _______________. |
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| Surface waves are also known as _______________. |
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| __________________ are the slowest waves and are felt at the surface. |
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| Surface waves cause ______________. |
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| The layers of the Earth are ________________________. |
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| crust, mantle, outer core, and inner core |
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| The Earth's crust is the __________ most layer. |
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| The crust is the _________ layer of all. |
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| The ____________ is solid rock and is deeper under continents than oceans. |
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| The mantle is the ____________ layer. |
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| The ____________ is the layer of rock lying below the crust. |
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| The core in made of two parts: _____________ core. |
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| The __________ is totally liquid and made of melted iron. |
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| The ____________ is in the center of the Earth and is a solid sphere. |
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