| Term | Definition |
|---|
| element | substance that cannot be broken down into simpler substances |
| compound | substance made up of two or more elements chemically combined |
| physical property | characteristic that can be observed or measured without changing the composition of the substance |
| chemical property | any property that produces a change in the composition of matter |
| viscosity | resistance of a liquid to flowing |
| silica | material found in magma that is formed from the elements oxygen and silicon |
| pahoehoe | fast-moving, hot lava that has low viscosity |
| aa | cooler, slow-moving type of lava that hardens to form rough chunks |
| temperature and silica content | main factors that affect magma's viscosity |
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