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Preview. Introduction of terms Density. A. Terms. Observation – interaction with the environment - use your 5 senses Inference – a guess based on observations Law of uniformitarianism – the present is the key to the past. Prediction – a guess (inference) about the future

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  1. Preview Introduction of terms Density

  2. A. Terms • Observation – interaction with the environment- use your 5 senses • Inference – a guess based on observations • Law of uniformitarianism – the present is the key to the past

  3. Prediction – a guess (inference) about the future • Cyclic – occurs in a pattern, over and over- easy to predict- example: phases of the moon • Non-cyclic – occurs randomly- difficult to predict- example: earthquake

  4. B. Density • Density is a physical property • can be used to identify a substance • does not change if material is broken into pieces • Density = mass / volume • Most objects are most dense as a solid • Water is the exception • Water expands when it freezes • Solid water – ICE - floats • Water is most dense (1 g/mL) as a liquid at 3.98°C

  5. Temperature • As temperature increases, density decreases • Warm air rises because it is less dense • Pressure • As pressure increases, density increases

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