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Calcium Carbonate- []

Horizontal and Uniformitarianism Notes- ** Horizontal  ** means level like a floor, not higher or lower on one side or the other. Each new deposit of sediment forms a new horizontal layer on top of the layers below. Geologists call this the ** principle of original horizontality. ** That is, layers of sediment are generally deposited in a horizontal or nearly horizontal position. ** Uniformitarianism  ** means that the present is the key to the past. This means that geologists use the observations they make about processes happening today, such as erosion, deposition, and the formation of sand and clay, to ** infer ** events that happened in the past, events they were not able to observe. The idea is that the way things happen today is the same way things have always happened. The processes are ** uniform. **