The document discusses three geological principles: the Law of Superposition states that in an undisturbed sequence of rock strata, older rocks will be below younger rocks; the Law of Original Horizontality states that sedimentary rocks are deposited in horizontal layers; and the Law of Uniformitarianism asserts that the geological processes observed in the present have operated throughout Earth's history in a similar manner and intensity.

1. Law of Superposition Law of Original Horizontality Law of Uniformitarianism

2. Normally the oldest rock layer is on the bottom, and the youngest rock layer is on the top. Think about your clothes pile Picture:

3. Sediment settles out of water in horizontal layers; larger sediment settles first, and smaller sediment settles last

4. The geologic processes that happen on the Earth today happened the same way in the past (volcanoes, mountain building, etc.) The Earth slowly and constantly changing