Earth's History Crossword Puzzle

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QUESTIONS LIST: extrusion : igneous rock that has formed from lava, meteorite : passes through the earth's atmosphere and strikes the ground, mass extinction : widespread and rapid decrease in biodiversity, eon : a very long period of time, superposition : this law states that the oldest layer is at the base of the rock and the layers get younger as you ascend, catastrophic event : very harmful or disastrous that results in substantial damage, geologic time : used by scientists to describe the timing and relationships of events in geologic history, strata : sedimentary rock's layers, ice age : a long period in the reduction of temperature indicated by the expansion of ice sheets and glaciers, intrusion : igneous rock that has crystallized from molten magma, younger : cross-cutting principle states that the geologic feature which cuts another is the _ of the two features, absolute : the type of age that can be plotted on a calendar, periods : a subdivision of geological time to show when a rock originated, relative : the type of age where the age of a rock is determined by comparing whether it is younger than other material around it, index fissile : useful for dating the strata where it is found, coal beds : a layer (stratum) of mineral coal, unconformity : surface contact between two groups of strata, stromatolites : a calcium mound where lime-secreting bacteria are trapped and contain some of the earliest known fossils, photosynthesis : the process how some organisms make food from sunlight to create oxygen as a byproduct, outcrop : a rock formation that is visible on the surface