Explaning The Earth Flashcards
Facts on sedimentary rocks
They can contain fossils
The grains can tell us the conditions of the rock
How are igneous rocks fromed
When Magma. Was forced into the exciting sedimentary rock and cooled
How are the sizes of crystals evidence for the speed of cooling
If the rock cooled slowly there will be large crystals if it cooled slow there will be small crystals
How are metamorphic rocks formed
When a sedimentary or igneous rock is compressed by the earths movements it forces the rock further down the heat molds the rock in to a new one
Eg of metaphoric rocks
Marble and sand stone
Eg of sedimentary rock
Slate
Eg is igneous
Granite
Creationism
Theory that the earth was created by God and taut all rocks were the same gas most scientists don’t believe this
Catastrophisum
That the shape of the surface of the earth was made by a series of catastrophes eg earthquakes floods volcano erpuptions
Uniformitarianosm
That we might be able to find out the Origen of ancient rocks by studding the present day eg weathering transport and sedimentation
Modern ideas
Geologist accept that Uniformitarianosm is basically correct but that there are catastrophic events as well that shape the earth
Rock cycles
Rocks get weathers then small sediments get transported then they are deposited the layers of sediments get squashed and a sedimentary rock is formed some of those rocks get heated and squashed in to a metamorphic rock if it is heated enough it form magma which cools into igneous
How are sedimentary rocks formed
Pre exciting rocks are weathers and then eroded the sediments will be transported by eg wind when the wind stop the sediment are deposited some crystals are made in the gap and Lauren on top of each other
