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6th Grade

Rocks unit

Rock a naturally occurring solid mixture of one or more minerals or organic matters
Rock cycle the series of processes in which a rock forms, changes from one type to another, is destroyed, and forms again by geological processes
Erosion sediment being transported/moved by wind, water, ice, or gravity
Weathering process in which water, wind, ice, and heat break down rock
Deposition the process in which sediment is laid down/dropped off
Composition the chemical make up of the rock; what minerals are inside it
Texture the quality of a rock that is based on the sizes, shapes, and position of the rock's grains
Igneous forms when hot, liquid rock cools and solidifies
magma hot, liquid rock below ground
lava hot, liquid rock above ground
Extrusive igneous forms from lava, on Earth's surface, fine grained
Fine grained Extrusive igneous rocks' texture; smooth
Intrusive igneous forms from magma under Earth's surface, coarse grained
Coarse-grained Intrusive igneous rocks' texture; bumpy
Three ways magma forms 1) PRESSURE is decreased. This allows the minerals to melt. 2) TEMPERATURE is increased. 3) COMPOSITION is changed. This may change the melting point of the rock, and it will melt.
Stratification forming sedimentary rocks (weathering, erosion, deposition, lithification)
Lithification compaction and cementation of rock layers/strata * Layers being squeezed together and then glued together*
3 Types of sedimentary rock Clastic, organic, and chemical
Sedimentary rock contain strata, formed from sediment Formed through stratification
Metamorphic rock formed through extreme heat and pressure
Metamorphism rocks changing form
Deformation rocks changing shape due to stress/bending
Foliated metamorphic rock whose minerals are arranged in bands
Nonfoliated metamorphic rock whose minerals are not arranged in bands
Examples of organic sedimentary rocks Coal and coral
How are rocks MAINLY classified? By how they form
What are two other ways rocks can be classified? Texture and composition (minerals inside)
Which rocks can be weathered and eroded? ALL
Clastic sedimentary rock Sedimentary rock made up of rock fragments
Created by: Mrs. Corey