uniformitarianism - geologic processes that happen today are like those that happened in the past, relative age dating - scientist use the principles of uniformitarianism to guess the age of rocks and fossils, geologists - scientist that studies the Earth and rocks, weathering - winds, floods, erosion- wear down rocks over time, sediment - small pieces of rock that breaks off due to weathering, strata - the layer of rock that is made when sediments compress together, Striation - marks in the layer of rock that is made when sediments compress together in rocks that can help show if an area ever experienced glaciation, Glaciation - at some time in the past, an area was covered entirely with ice, unconformity - a surface where rock has eroded away, making a break or gap , disconformity - younger sedimentary layers are deposited on top of older, horizontal sedimentary layers that have been eroded, angular unconformity - sedimentary layers are deposited on top , key beds - rocks or sediment layers that are used as a marker to correlate rock layers, key beds used with the principle of superposition - the rule is the layers above a key bed are younger than the layers below it,

Geologic Time 1

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