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To spead or cover a surface, as a blush over the face.
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The two sub-layers of the earth's crust
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| A subsea chasm extending along the crest of a mid-ocean ridge, locus of the magma upwellings that accompany seafloor spreading.[image] |
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| The determination of the age of an object with reference to a specific time scale[image] |
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Uniformitarianism
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supporting, conforming to, or derived from a theroy or doctrine about uniformity, especially on the subject of geology. [image] |
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Renewable resource
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| any natural resource that can replenish itself naturally over time, as wood or solar energy; also called renewable energy.[image] |
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| the brown, hard outer portion or surface of a loaf or slice of bread.[image] |
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| The lateral movement of continents resulting from the motion of crustal plates.[image] |
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| any remains, impression, or trace of a living thing of a former geologic age, as a skeleton, footprint.[image] |
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| The rigid outer layer of the earth, having an average thickness of about 75 km and comprising the earth's crust and the solid part of the mantle above the asthenosphere.[image] |
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| The hypothetical landmass that existed when all continents were joined, from about 300 to 200 million years ago.[image] |
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Convergent boundary
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| a major geologic discontinuity or suture marking the juncture of lithospheric plates that have been joined by plate tectonic.[image] |
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| A widely distributed fossil, of narrow range in time, regarded as characteristic of a given geological formation, used especially in determining the age of related formations.[image] |
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| A form of energy obtained from within the earth, originating in its core; also, energy produced by extracting the earth's internal heat.[image] |
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| The region below the lithosphere, variously estimated as being from fifty to several hundred miles (eighty-five to several hundred kilometers) thick, in which the rock is less rigid than that above and below but rigid enough to transmit transverse seismic waves.[image] |
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Convection current
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The transfer of heat by the mass movement of heated particles into an area of cooler fluid.[image] |
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| In archaeology, the arrangement of artifacts or events in a sequence relative to one another but without ties calendrically measured time; the arrangement of artifacts in a typological sequence or seriation. [image] |
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