27.3 vocab Flashcards
process by which water enters earth
infiltration
the upper boundary of the saturated zone
water table
rock unit that can transfer water through its pore space
aquifer
percentage of the materials total volume
porosity
process of assigning an exact numerical age
absolute dating
process of placing objects or events in their proper order
relative dating
states that the laws of nature operate today
uniformitarianism
states that an undisturbed sequence of sedimentary rock layers the youngest rock will be at the top
principle of superposition
are gaps in the rock recorded during which either erosion occured
unconformity
remains or traces of organisms found in the geological rock recorded
fossil
what percentage of water on earth is salt water
97%
what percentage of water on earth is freshwater
2%
where is the majority of freshwater found
glaciers
where is the smaller percentage of freshwater found
1%
what is precipitation
water vapor cools and condenses