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- Fossils and rocks
- Continental shapes (including continental shelves)
- Ocean structures (e.g. ridges, fracture zones, and trenches)

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E.g. earthquake, volcanoes, meteor impact.

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E.g. plate motion, mountain uplift.

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E.g. landslide, microscopic geochemical reactions.

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E.g. plate motion, uplift of large mountains

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(i.e. weathering, erosion, deposition)

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- Natural causes (e.g. changes in solar radiation, volcanic activity)
- Human causes (e.g. fossil fuel combustion, cement production, agriculture)

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Wind is simply the movement of air from an area of high pressure to an area of low pressure.

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A form of water (e.g., hail, rain, sleet, snow) that condenses in the atmosphere and falls to Earth’s surface.

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A measure of the amount of water vapor in the air.

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Air pressure increases as altitude decreases.

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A measure of how hot or cold a substance is; a measure of the average kinetic energy of the particles of a substance.

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Temperature, pressure, humidity, precipitation, & wind.

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Warm fronts & cold fronts.

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When a warm air mass moves into an area of cooler air, a warm front will form as shown in Figure 4. The warm air is less dense than the cooler air and cannot push the cooler out of the way.

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Differences in air pressure will cause air masses to move. When a cold air mass moves into an area of warmer air, the denser cold air will force the warmer air to rise at the frontal boundary. This situation is called a cold front as seen in Figure 2.

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An air mass will form when air sits over an area for a long period of time. The air mass will take on the same characteristics as the surface beneath.