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cliff |
Noun
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a steep high face of rock |
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closed chain |
Noun
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(chemistry) a chain of atoms in a molecule that forms a closed loop |
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closed universe |
Noun
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(cosmology) a universe that is spatially closed and in which there is sufficient matter to halt the expansion that began with the big bang |
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cloud bank |
Noun
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a layer of clouds seen from a distance |
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coastal plain |
Noun
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a plain adjacent to a coast |
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coastland |
Noun
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land in a coastal area |
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coffee grounds |
Noun
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the dregs remaining after brewing coffee |
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cystolith |
Noun
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a calculus formed in the bladder |
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col |
Noun
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a pass between mountain peaks |
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cataract |
Noun
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a large waterfall |
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cataract |
Noun
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an eye disease that involves the clouding or opacification of the natural lens of the eye |
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comet |
Noun
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(astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit |
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cation |
Noun
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a positively charged ion |
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cave |
Noun
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a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea |
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cave |
Verb
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to explore natural caves |
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cave |
Verb
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to hollow out as if making a cave or opening |
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cavern |
Noun
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a large cave or a large chamber in a cave |
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cavern |
Noun
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any large dark enclosed space |
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cavern |
Verb
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to hollow out as if making a cavern |
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continental glacier |
Noun
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a glacier that spreads out from a central mass of ice |
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continental shelf |
Noun
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the relatively shallow (up to 200 meters) seabed surrounding a continent |
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celestial body |
Noun
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natural objects visible in the sky |
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continental slope |
Noun
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the steep descent of the seabed from the continental shelf to the abyssal zone |
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contrail |
Noun
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an artificial cloud created by an aircraft |
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condensation trail |
Noun
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an artificial cloud created by an aircraft |
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chemical chain |
Noun
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a series of linked atoms, generally in an organic molecule |
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coprolite |
Noun
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fossil excrement |
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coprolith |
Noun
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a hard mass of fecal matter |
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coral reef |
Noun
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a reef consisting of coral consolidated into limestone |
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cove |
Noun
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a small inlet |
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cove |
Noun
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small or narrow cave in the side of a cliff or mountain |
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crevice |
Noun
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a long narrow opening |
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crevice |
Noun
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a long narrow depression in a surface |
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crag |
Noun
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a steep rugged rock or cliff |
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cranny |
Noun
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a small opening or crevice (especially in a rock face or wall) |
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cranny |
Noun
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a long narrow depression in a surface |
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crater |
Noun
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a bowl-shaped depression formed by the impact of a meteorite or bomb |
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crater |
Noun
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a bowl-shaped geological formation at the top of a volcano |
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craton |
Noun
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the part of a continent that is stable and forms the central mass of the continent |
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crevasse |
Noun
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a deep fissure |
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crystallite |
Noun
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any of numerous minute rudimentary crystalline bodies of unknown composition found in glassy igneous rock |
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cultivated land |
Noun
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arable land that is worked by plowing and sowing and raising crops |
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coal |
Noun
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a hot fragment of wood or coal that is left from a fire and is glowing or smoldering |
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coal |
Noun
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fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period |
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coal |
Verb
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to take in coal |
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coal |
Verb
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to supply with coal |
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coal |
Verb
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to burn to charcoal |
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cumulonimbus |
Noun
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a dark cloud of great vertical extent charged with electricity |
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cumulonimbus cloud |
Noun
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a dark cloud of great vertical extent charged with electricity |
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cumulus cloud |
Noun
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a globular cloud |