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Felsic magmas as they contain more silica molecule (si02) and are therefore more viscous (cannot flow as easily as mafic magmas) meaning more pressure can build up behind the magma before an eruption happens...

The Bouma sequence is used to identify turbidite (underwater debris flows) deposits within the rock record. It has five subclassifications:T e - massive mudstoneT d - planar laminated siltsT c - rippled or c...

Crystal size is used to distinguish between intrusive and extrusive igneous rocks. Intrusive rocks such as granite will have coarse crystals whereas extrusive rocks such as basalt will have fine glassy cryst...

Both oceanic and continental crust are less dense than the underlying mantle rocks which are ~3.3g/m 3 and therefore they 'float' on top of the mantle. Oceanic crust is formed primarily of dense basaltic roc...

An anticline is an arch-like fold which has the oldest beds at its core and the layers become younger towards the edges of the fold. A typical anticline is convex up in which the hinge or crest is where the ...