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How are rocks classified?
Terms in this set (16)
molten rock;partially melted rock
"fire"; may form below or above Earths surface. Usually hard, they don't have layers but they often have crystals that interlock.
is a quickly cooled igneous rock. Most of earth's crust beneath the oceans is basalt.
looks like glass.It forms when lava cools very rapidly after the eruption of a volcano.
forms from lava that has lots of trapped gas bubbles.Some pumice has so many tiny pockets of air that it floats!
is slowly cooled igneous rock.Its large crystals of quartz,feldspar,and mica are easy to see.
contains the same minerals as granite.It cools and hardens very slowly.It often has very large crystals.
cools slowly.The minerals in it may separate into layers.
rocks form layers of sediments settle on top of one another and harden.Sediments are made up for soil,shells,bits of rock,and remains of dead plant and animal matter.
can form from tiny bits of skeletons and shells.
can form from quartz sand.
forms from tiny particles.
rock forms.Means "Change of form."Metamorphic rocks can form from sedimentary rocks,igneous rocks, and even other metamorphic rocks.
forms from sedimentary rock.Layering of the minerals mica and chlorite makes it shiny.
forms from the sedimentary rock shale.Slate easily splits into layers.
can form from sedimentary or igneous rock.It forms at very high pressures and temperatures.
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