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| https://commons.wikimedia.org/wiki/File:Rock_Layers_at_Quebrada_de_las_Conchos_-_Salta_Argentina.jpg |
Summary:
There is two different kinds of age, relative age and absolute age. An example of relative age is she is younger then her brother, an example of absolute age is she is 13 years old so absolute is more specific while relative is more general. The law of superposition says that if something cuts across a body of rocks it is younger than the rocks that it goes through. Faults like the San Andreas fault are always younger then the rock that it cutes through. Index fossils also help geologist tell the relative age of a layer of rocks which the fossils occur. When lava cools on the surface it is called an extrusion and it is younger then the rock below but when law cools below the surface it is called an intrusion and it is always younger ten the surrounding rock layers. Unconformities are also when new rock layers are much younger then the rocks below it.
S&EP: SP3: Planning and carrying out investigations:
This week we did a lab about the rock cycle first we cut up the starbursts to make it like sediments. After we did that then we had to press them together and compact them to make sedimentary rock. Then we had to take the sedimentary rock from there and make it into metamorphic by pressing down on the starburst with lots of pressure till it was almost flat. After that then we had to melt down the metamorphic and then cool it to make igneous rock. This gave a visual of the rock cycle and what steps it goes through.
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