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Final Study Guide

8th Grade Final Study Guide

The average distance from earth to the sun Astronomical Units
The time it takes an object to travel once around the sun Period of Revolution
The time it takes an object to complete one rotation on its axis Period of Rotation
Orbit the sun in the asteroid belt Asteroids
is the process by which atoms form a solid with an orderly, repeating pattern. Some crystals are formed from magma and other are from water. Crystallization
minerals that are valuable because of their appearance Gemstones
is an naturally occurring solid mixture composed of minerals, smaller rock fragments, organic matter, or glass Rock
when lava cools and crystallizes on Earth's surface Extrusive Rock
when magma cools and crystallizes inside Earth Intrusive Rock
the process of laying down sediment in a new location. Deposition
is the extinction of many species on Earth within a short period of time Mass Extinction
connects two continents that were previously separated Land Bridge
a body of water formed when ocean water floods continents Inland Sea
an oxygen poor environment where, over time, plant material changed into coal Coal Swamp
a time when a large proportion of Earth's surface is covered with glaciers Ice Age
large mammals of the Cenozoic era Mega Mammals
the living or once-living parts of an environment Biotic
the non-living parts that the living parts of an environment need to survive. Abiotic
is a geographic area on Earth that contains ecosystems with similar biotic and abiotic features Biomes
the process of one ecological community gradually changing into another Ecological Succession
a stable community that no longer goes through major ecological changes Climax Community
the first species that colonize new or undisturbed land. Pioneer Species
when a freshwater ecosystem changes over time in a natural, predictable process Aquatic Succession
Created by: CompelledControl