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All Words Glossary

Glossary of Geology Terms
beginning with letter M
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maar Tweet Definition of maar Like Definition of maar on Facebook
noun (pl=maars, pl2=maare)
  1. a broad volcanic crater, usually filled with a lake
magma Tweet Definition of magma Like Definition of magma on Facebook
noun
  1. (geology) The molten matter within the earth, the source of the material of lava flows, dikes of eruptive rocks, etc.
  2. (mathematics) A classification of algebraic structures.
mantle Tweet Definition of mantle Like Definition of mantle on Facebook
noun
  1. a piece of clothing somewhat like an open robe or cloak, especially that worn by Orthodox bishops
  2. (figuratively) anything that covers or conceals something else
  3. the zone of hot gases around a flame; the gauzy incandescent covering of a gas lamp
  4. (anatomy) the cerebral cortex
  5. (geology) the layer between the Earth's core and crust
  6. (zoology) the body wall of a mollusc/mollusk
  7. An alternative spelling mantel
(wikipedia, mantle (geology))
(
wikipedia, mantle (mollusc))      
marl Tweet Definition of marl Like Definition of marl on Facebook
noun
  1. A mixed earthy substance, consisting of carbonate of lime, clay, and possibly sand, in very variable proportions, and accordingly designated as calcareous, clayey, or sandy.
verb
  1. To cover, as part of a rope, with marline, marking a peculiar hitch at each turn to prevent unwinding.
massif Tweet Definition of massif Like Definition of massif on Facebook
noun
  1. A principal mountain mass.
  2. A block of the earth's crust bounded by faults or flexures and displaced as a unit without internal change; normally consists of gneisses and schists
mature Tweet Definition of mature Like Definition of mature on Facebook
verb (matures, maturing, matured)
  1. To become mature; to ripen; to gain experience or wisdom with age.
adjective
  1. fully developed; grown up in terms of physical appearance, behaviour or thinking; ripe
She is quite mature for her age.
  1. profound; careful
The headmaster decided to expel to boy after mature consideration.
  1. the growth of behavior and thinking
measure Tweet Definition of measure Like Definition of measure on Facebook
noun
  1. The quantity, size, weight, distance or capacity of a substance compared to a designated standard.
  2. An (unspecified) quantity or capacity :
a of salt
(rfdate) The unwise man never knows the of his stomach. " from the w:Hí¡vamí¡l, Hí¡vamí¡l
  1. The precise designated distance between two objects or points.
  2. The act of measuring.
  3. A musical designation consisting of all notes and or rests delineated by two vertical bars; an equal and regular division of the whole of a composition.
  4. A rule, ruler or measuring stick.
  5. A tactic, strategy or piece of legislation.
He took drastic measures to halt inflation.
  1. (mathematics) A function that assigns a non-negative number to a given set following the mathematical nature that is common among length, volume, probability and the like.
  2. An indicator; Something used to assess some property.
The average price of basic household goods is a for inflation.
Honesty is the true of a man. (rfex)
verb (measur, ing)
  1. To ascertain the quantity of a unit of material via calculated comparison with respect to a standard.
  2. To estimate the unit size of something.
  3. To obtain or set apart; to mark in even increments.
(rfex)      
member Tweet Definition of member Like Definition of member on Facebook
noun
  1. One who officially belongs to a group.
  2. A limb.
  3. The penis.
  4. (logic) One of the propositions making up a syllogism.
  5. (settheory) An element of a set.
Mesozoic Tweet Definition of Mesozoic Like Definition of Mesozoic on Facebook
proper noun
  1. (geology) The Mesozoic era.
adjective
  1. (geology) Of a geologic era within the Phanerozoic eon and comprises the Triassic, Jurassic and Cretaceous periods from about 230 to 65 million years ago when life on earth was dominated by reptiles.
metamorphic Tweet Definition of metamorphic Like Definition of metamorphic on Facebook
noun
  1. (mineralogy) A rock that has been changed from its original form by subjection to heat and/or pressure.
adjective
  1. (geology) Having been structurally altered as a result of, or resulting from, exposure to intense heat &/or pressure (at the contact zone between colliding plates, for example).
metamorphism Tweet Definition of metamorphism Like Definition of metamorphism on Facebook
noun
  1. (mineralogy) The process by which rocks are changed into other forms by the application of heat and/or pressure.
  2. (zoology) The process by which insects development through life stages -- as, for example, those of embryo, larva, pupa and imago. The life cycle of the butterfly is one of complete metamorphosis, in which the embryo grows within the egg, hatches into the larval stage caterpillar, enters the pupal stage within its chrysalis, and finally emerges as an adult butterfly imago.
metasomatism Tweet Definition of metasomatism Like Definition of metasomatism on Facebook
noun
  1. (geology) the process by which the bulk chemical composition of a rock is changed by the introduction ofcomponents from an external source, especially by a hydrothermal fluid
microearthquake Tweet Definition of microearthquake Like Definition of microearthquake on Facebook
noun
  1. An very low intensity earthquake, (usually three or less on the Richter scale).
microtektite Tweet Definition of microtektite Like Definition of microtektite on Facebook
noun
  1. A microscopic tektite.
microtremor Tweet Definition of microtremor Like Definition of microtremor on Facebook
noun
  1. (geology) Any of the continuous background movements of the Earth's surface and interior, having a period of 1 to 9 seconds, not associated with any seismic activity
middle Tweet Definition of middle Like Definition of middle on Facebook
noun
  1. A centre, midpoint
The of a circle is the point which has the same distance to every point of circle.
  1. The part betweeen the beginning and the end.
  2. (cricket) the middle stump
  3. The central part of a human body.
adjective
  1. Being in the or in-between; as middle point, middle name, Middle English, Middle Ages, middle weight, etc.
  2. Central to.
Miocene Tweet Definition of Miocene Like Definition of Miocene on Facebook
proper noun
  1. (geology) The Miocene epoch.
adjective
  1. (geology) Of a geologic epoch within the Neogene period from about 23 to 5.3 million years ago; marked by the drift of continents to their present position.
Mississippian Tweet Definition of Mississippian Like Definition of Mississippian on Facebook
proper noun (Mississippians)
  1. An inhabitant or a resident of the state of Mississippi.
  2. (geology) The Mississippian epoch.
adjective
  1. (geology) Of a geologic epoch within the Carboniferous period from about 359 to 318 million years ago; marked by glaciation and the appearance of the first trees.
  2. Of, or pertaining to, Mississippi or its culture
monocline Tweet Definition of monocline Like Definition of monocline on Facebook
nounMonocline
  1. (geology) A unidirectional dip in strata that is not a part of an anticline or syncline
  2. (geology) A single flexure in otherwise flat-lying strata
moulin Tweet Definition of moulin Like Definition of moulin on Facebook
noun (plural moulins)
  1. a cylindrical, vertical shaft that extends through a glacier and is carved by meltwater from the glacier's surface.
mudflow Tweet Definition of mudflow Like Definition of mudflow on Facebook
noun
  1. A type of landslide characterized by large flows of mud and water.
  2. The dried-out product of such a flow. Also called mudslide, mudspate.
mylonite Tweet Definition of mylonite Like Definition of mylonite on Facebook
noun
  1. (geology) any rock that has undergone modifications due to dynamic recrystallization following plastic flow

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