Fault  - (of a rock formation) be broken by a fault or faults., Index Fossil - a fossil that is useful for dating and correlating the strata in which it is found., Trace Fossil - a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself., River Basin - the area drained by a river and its tributaries, pH - a measure of how acidic or basic a solution is, Eon - an indefinite and very long period of time, Era - a major division of time that is a subdivision of an eon and is itself subdivided into periods., Period - a length or portion of time., Evolution - the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth., Wetland - land consisting of marshes or swamps; saturated land., Water table - the level below which the ground is saturated with water., Runoff - the draining away of water (or substances carried in it) from the surface of an area of land, a building or structure, turbidity - a measure of the clarity of the water (how clear is it?) High turbidity= dirty water, Cenozoic Era - During this era, plants and animals look most like those on Earth today., Mesozoic Era - This era includes the Triassic, Jurassic, and Cretaceous Periods, names that may be familiar to you., Paleozoic Era - fish diversified and marine organisms were very abundan, Aquifer - underground bed or layer yielding ground water for wells and springs etc, Estuary - the area where a freshwater stream or river merges with the ocean. Often a nursery for young., Epoch - a period of time in history or a person's life, typically one marked by notable events or particular characteristics., Ice core - a cylinder of ice removed from an ice sheet (glacier) that helps scientists understand past CLIMATES and how ATMOSPHERIC conditions have changed over time,

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