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DSMS Life History

Earth and Life History

WordDefinition
sedimentary rock rock formed when sediment is lithified
paleontologist a scientist who studies fossils and ancient life
rock cycle the process involving the formation and recycling of rock
extinct when all of the members of a species die
oxygen gas produced by anaerobic prokaryotes during Precambrian time
ozone forms a layer in the atmosphere that shields solar radiation
anaerobic living without oxygen
uniformitarianism the idea that geologic processes that occur today also occurred in the past
igneous rock rock formed when lava or magma cools
superposition principle that states younger rocks are on top of older rocks
Precambrian time period when there was no oxygen in the Earth's atmosphere
Paleozoic era era when plants and animals first lived on land
Cenozoic era era dominated by mammals
Pangaea a large landmass that contained all the present-day continents
metamorphic rock rock formed when existing rock is squeezed or partially melted
absolute dating dating method that determines a fossil or events exact age
relative dating dating method that compares the age of one specimen or event to another
geologic time scale organizes the history of life on Earth
plate tectonics the study of the movement of Earth's continental plates
fossil the solidified remains or imprints of once-living organisms
mass extinction when a large number of species dies off in a short period of time
weathering the gradual breakdown of rock, usually by wind or water
erosion when sediment is carried away, usually by wind or water
catastrophism the idea the geologic events occur suddenly
Mesozoic Era era dominated by dinosaurs
crystallization when a solid forms into an organized structure called a crystal
Created by: csimpson
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