Geologic Time Scale Flashcards
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Life on land ____ ___ ___ in the tropical climates and warm shallow seas during which time period
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Developed and Flourished and the Paleozoic Era
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Throughout what era as different land environments formed and ___ levels changed new life forms developed.
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Paleozoic Era and Sea Levels
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Life forms that could not adapt or find suitable conditions (especially ___species) disappeared as a result of _____
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Marine Species and Pangaea
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As continents collided and mountains built up due to ___________, volcanoes also formed. _____ _____ continued to be common in the Paleozoic Era.
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Plate tectonics and Volcanic activity
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Began with the 1. (such as ___ and brachiopods) continued to develop 2. early vertebrate ___ 3. arachnids and ____ 4. 1st ____ and near the era's end the ____ became dominant (Paleozoic Era)
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early invertebrates, trilobites, fish, insects, amphibians, reptiles
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Early land plants included: ___ ____, ____, ____-____ ____
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simple mosses, ferns, cone-bearing plants
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By the end of the Paleozoic Era, ____ ___ were common.
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Seed plants
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The mass extinction caused by ____. Most ____ invertebrates and _____ disappeared.
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Pangaea, marine, amphibians
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What time period were Cyanobacteria, oxygen being a major atmospheric gas, shielding of Earth from ultraviolet rays, complex organisms, and invertebrates in?
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Precambrian Time
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What time period were organisms with hard parts, fish, amphibians, reptiles and Pangaea in?
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Paleozoic Era
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What goes through photosynthesis and produces oxygen?
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Cyanobacteria
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Were there a lot of fossils in the Precambrian Time? Why?
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No because there weren't many organisms with hard parts they were mostly invertebrates
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The longest geologic time are called
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Eons
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The division of Earth's history into time units makes up the...
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Geologic Time Scale
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A group of organisms that reproduce only with members of their group is a...
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Species
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Pangaea formed during what time period?
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Paleozoic
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A subdivision of eras is called ____ are characterized by the types of life existing worldwide
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Periods
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This helps scientists divide Earth's history into time units
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Fossils
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The oldest rocks on earth contain _____ fossils
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Only a few
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What is the longest part of Earth's history?
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Precambrian
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Cyanobacteria are _____ bacteria thought to be one of the earliest life forms on Earth.
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Blue-green
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