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Science Vocab Ch. 7

Geologic Time; Lessons 1 - 4

TermDefinition
Eons ... are the longest units of geologic time.
Eras Eons are subdivided into smaller units of time called ...
Periods Eras are subdivided into ...
Epochs Periods are subdivided into ...
Mass Extinction A ... is the extinction of many species on Earth within a short period of time.
Land Bridge A ... connects two continents that were previously separated.
Geographic Isolation ... is the separation of a population of organisms from the rest of its species due to some physical barrier, such as a mountain range or an ocean.
Paleozoic Era The ... is the oldest era of the Phanerozoic eon.
Mesozoic Era The ... is the middle era of the Phanerozoic eon.
Cenozoic Era The ... is the youngest era of the Phanerozoic eon.
Inland Sea An ... is a body of water formed when ocean water floods continents.
Coal Swamp A ... is an oxygen-poor environment where, over time, plant material changes into coal.
Supercontinent A ... is an ancient landmass which separated into present-day continents.
Dinosaur ... were dominant Mesozoic land vertebrates that walked with legs positioned directly below their hips.
Plesiosaur ... were Mesozoic marine reptiles with small heads, long necks, and flippers.
Pterosaur ... were Mesozoic flying reptiles with large, batlike wings.
Holocene Epoch The most recent epoch, the ..., began 10,000 years ago.
Pleistocene Epoch The ... was the first epoch of the Quaternary period.
Ice Age An ... is a time when a large proportion of Earth's surface is covered by glaciers.
Glacial Groove ... are grooves made by rocks carried in glaciers.
Mega-Mammal The large mammals of the Cenozoic era are called ...
Created by: stemljos4017