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| A sudden,radical,or complete change.A fundamental change in political oraganization. |
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| A permanently forzen layer at variable depth below the surface in frigid regions of a planet(as earth). |
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| An irregularly recurring flow of unusually warm surface waters coast of South America that prevents up welling of nutrient-rich cold deep water and that disrupts typical regional and global weather pattern. |
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| A theory in geology;the lithosphere of the earth is divided into a small number of plates which float on and travel independently over the mantle and much of the earth's seismic activity occurs at the boundaries of these plates. |
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| either of the two points on the celestailsphere where the celestial equator intersects the ecliptic.Either of the two times each year(as about March 21 & September 23) when the sun crosses the equator and the day and night are everywhere of equal length. |
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| A water-bearing stratum of permeable rock,sand,or gravel. |
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| An ecological community composed of shrubby plants adapted to dry summers and moist winters that occurs especially in Southern California. |
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| Any of an order( coniferales)of mostly evergreen trees and shrubs including forms(as pines)with true cones and others(as yews)with arillate fruit. |
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| A tentative assumption made in order to draw out and test it's logical or empirical consequences. |
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| Is one of more than 500,000 entries available at Merriam.Increase in the gobal average surface temperature resulting from enhancement of the green house effect,primarily by air pollution. |
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| The action or process of the edge of one crustal plate descending below the edge of another. |
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| Wind in a region that blows in a fairly constant directional pattern |
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| Island chain central pacific extending 1250 miles(2012 kilometers)WNW from main inlands of the Hawaiian group;includes Nihoa, Necker, Laysan, Midway, and Kure islands. |
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| The apparent deflection of a moving object that is the result of the Coriolis force. |
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| Include Mercury, Venus, Earth, and Mars. These planets have solid surfaces, with the last three also having an atmosphere. Their size, radius, and density are all similar. |
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| The removal of salt from seawater to make it usable for drinking and farming. |
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| Forest with both coniferous and deciduous trees. |
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| A fertile or green area in an arid region (as a desert), something that provides refuge,relief, or pleasant contrast. |
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| An unstratified usually buff to yellowish brown loamy deposit found in North America, Europe, and Asia and believed to be chiefly deposited by the wind. |
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| Trees, usually broad leaved such as oak and maple, that lose their leaves in Autumn. |
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