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6 Topic 11

Topic 11 History of Earth

TermDefinition
relative age the age of a rock compared to the ages of other rocks
absolute age the age of a rock given as the number of years since the rock formed
law of superposition the geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it
unconformity a gap in the geologic record that shows where rock layers have been lost due to erosion
radioactive decay the process in which the nuclei of radioactive elements break down, releasing fast-moving particles and energy
radioactive dating the process of determining the age of an object using the half-life of one or more radioactive isotopes
geologic time scale a record of the geologic events and life forms in Earth's history
era one of the three long units of geologic time between the Precambrian and the present
period one of the units of geologic time into which geologists divide eras
invertebrate an animal without a backbone
vertebrate an animal with a backbone
amphibian a vertebrate whose body temperature is determined by the temperature of its environment, and that lives its early life in water and its adult life on land
reptile a vertebrate whose temperature is determined by the temperature of its environment, that has lungs and scaly skin, and that lays eggs on land
mass extinction when many types of living things become extinct at the same time
mammal a vertebrate whose body temperature is regulated by its internal heat, and that has skin covered with hair or fur and glands that produce milk to feed its young
Created by: muellershauna
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