Geologic Timescale - A timeline of Earth’s 4.6-billion-year history, divided into units and subunits based on rock and fossil evidence., Precambrian Time - The timespan that encompasses Earth’s first three eons, before complex life evolved., Cambrian Explosion -  The sudden appearance of complex, multicellular life forms on Earth 550 million years ago. , Cambrian Period - The first period of the Paleozoic Era., Permian Period - The last period of the Paleozoic Era., Mass Extinction - A widespread and rapid decrease in the amount and diversity of living things on Earth, Ecological Niche - The role and position a species has in its environment. Includes how it meets needs for food, shelter, and survival., Invertebrate - Animals without backbones., Vertebrate - Animals with backbones., Arthropod - Invertebrates with jointed legs, such as insects and crustaceans. , Pangaea - The most recent supercontinent from which our current continents broke off from., Ice Age - A time when a large proportion of Earth’s surface is covered by glaciers, Interglacial Period - Warm periods that occur within ice ages, during which glaciers retreat, Land Bridge - When glaciers form, sea levels drop and more dry land is exposed to connect previously isolated land masses., Inland Sea - When glaciers melt, sea levels rise and flood low lying land., Mega Mammal - Very large mammals that evolved in the Cenozoic but are now extinct., Holocene Epoch - The epoch in which we live., Quaternary Period - The period in which we live. , Phanerozoic Eon - The eon in which we live.,

Geologic Time

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