Post on 31-Dec-2015
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Warm-up:(Write your answer on the board please! Yes
really!)
1. What exactly is a rock?
The Rock Cycle The Rock Cycle is the Earth system that depicts the
interrelationships among the three general categories of rocks.
The Rock Cycle Molten magma
in the upper mantle rises
into the lithosphere,
where it cools and crystallizes to form igneous
rock.
Over time, this igneous rock is
weathered (eroded) by
liquid water, ice and/or wind
into sediment.
The sediment is eventually deposited in layers, which are compacted by the weight of the layers above. The process of cementation
forms sedimentary rocks. This is called lithification.
Over time heat from below and pressure from
above can cause these
sedimentary rocks to change form and change into
metamorphic rock.
If subjected to continuing heat
and pressure, the metamorphic
rocks can melt to become magma
again and the cycle begins again.
The Rock Cycle The full cycle does not always take place due to
“shortcuts” or interruptions.
Sedimentary rock melts
Sedimentary rock is
weathered
Igneous rock is metamorphosed
Metamorphic rock weathers
The Rock Cycle
Warm-up:How can you tell
what type of rock you are looking at?
1. Think about how igneous rocks are formed. How would an igneous rock look different from a sedimentary or metamorphic rock?
2. Think about how sedimentary rocks are formed. How would a sedimentary rock look different from an igneous or metamorphic rock?
3. Think about how metamorphic rocks are formed. How would an metamorphic rock look different from a sedimentary or igneous rock?