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lms science


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the tendancy for currents of air or water to seperate sediments according to size.
chemical stabilty
measure of the tendancy of a chemical compundto maintain its original chemical composition rather then break down to form a different chemical
intrusize igneous rock
rock formed from the cooling and solidifacation of magma beneaths earths surface
the material that makes up the solid parts of earth
describes magma or igneous rock that is rich in magnesium and iron and that is generally dark in color.
as sediment is transported from its source to where it is deposited the particles collide with each other and with other objects in their path.
partial melting
as the temp. increases and as other minerals melt, the magmas compostition changes.
magma flows upward and between rocks, it sometimes pushes the overlying rocks into a dome.
lies parallel to the layers of rock that suround it, even if the layers are tilted.
cut across layers rather then lying parallel to the rock layers
layering of sedimentary rock
intrusive forms that spread out over at least 100km when they are expsed at earths surface.
massive igneous rock structures commonly have evenly spaced zones of weakness
made of crystals
depositoinal enviroment
the enviroment where sediment is deposited
gradded bedding
different sizes and different shapes of sediment settle to different sizes.
stratified layers
the process in which the volume and porosity of a sediment is decreased by the weight of overlying sediments as a result of burial beneath other sedimentss
cross beds
some sedimentary rocks are characterized by slanting layers
sedimentary rock
when sediment deposits are compressed or cemented together and harden.
extrusive igneous rock
rock that forms from the cooling and solidifacation of lava at earths surface
the process in which minerals precipitate into pore spaces between sediment grains and bind sediments together to form a rock.
igneous rock
from fire : forms when magma cools and hardens
fractional crystallization
as the temp. decreases, the first minerals to crystallize from magma are minerals that have the highest freezing points. as magma changes composition and cools, minerals that have lower freezing points form.
reverse grading
smallest grains on the bottom and largest are top
massive beds
beds that have no internal structures
the process in which one type of rock changes into metamorphic rock becuase of chemical processes or changes in tempuature and pressure
metamorphic rock
the rock that forms when existing rock is altered.
describes magma or igneous rock that is rich in fledspars and silica and that is generally light in color.
similar to batholiths but cover less then 100km at the surface.
molten rock

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