Chapter 14 Earth Science Geologic Time.

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Presentation transcript:

Chapter 14 Earth Science Geologic Time

Words to Know – Section 1 Life and Geologic Time Geologic time scale Eon Era Period Epoch Organic evolution Species Natural selection Trilobite Pangea

Division of Earth’s history into time units based largely on the types of life-forms that lived during certain periods. Geologic time scale

Longest subdivision in the geologic time scale that is based on the abundance of certain types of fossils and is subdivided into eras, periods, and epochs. eon

Second-longest division of geologic time; is subdivided into periods and is based on major worldwide changes in types of fossils era

Third-longest division of geologic time; is subdivided into epochs and is characterized by the types of life that existed worldwide. period

Next-smaller division of geologic time after the period; is characterized by differences in life-forms that may vary regionally. epoch

Change of organisms over geologic time Organic evolution

Group of organisms that reproduces only with other members of their own group species

Process by which organisms that are suited to a particular environment are better able to survive and reproduce than organisms that are not Natural selection

Organism with a three-lobed exoskeleton that was abundant on Paleozoic oceans and is considered to be an index fossil trilobite

Large ancient landmass that was composed of all the continents joined together Pangea

Words to Know – Section 2 Early Earth History Precambian time Cyanobacteria Paleozoic Era

Longest part of Earth’s history, lasting from 4 Longest part of Earth’s history, lasting from 4.0 billion to about 544 million years ago Precambrian time

Chlorophyll-containing, photosynthetic bateria thought to be one of Earth’s earliest life-forms cyanobacteria

Era of ancient life, which began about 544 million years ago, when organisms developed hard parts, and ended with mass extinctions about 245 million years ago Paleozoic Era

Words to Know – Section 3 Middle and Recent Earth History Mesozoic Era Cenozoic Era

Middle era of Earth’s history, during which Pangea broke apart, dinosaurs appeared, and reptiles and gymnosperms were the dominant land life-forms Mesozoic Era

Era of recent life that began about 66 million years ago and continues today; includes the first appearance of Homo sapiens about 400,000 years ago Cenozoic Era