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Cards in this deck (2)
- 1SillsIntrusions that are formed parallel to bedding planes.
The bedding planes provide a line of weakness along which the magma flows before cooling and solidifying.
As it cools the magma contracts, producing cracks in the resultant rock. - 2DykesDiscordant because they cut along the bedding planes, often vertically.
Magma flows through cracks and weaknesses but cools and solidifies before reaching the surface.
Contraction joints develop parallel to the surface as magma solidifies.
Once expose, they dykes can appear as linear outcrops of resistant rocks.
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- Flashcards on Untitled, created by samantha.bell97 on 27/03/2015.
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- samantha.bell97 · Mar 2015
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- Feb 3, 2018
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