EAS105 Lecture Notes - Lecture 2: Submarine Volcano, Aplite, Aphanite
7 Mar 2018
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Chapter 1, p. 18-20; chapter 4, p. 86-109 the changing earth 7e. Definition:- a rock is a solid, cohesive aggregate of one or more minerals: cohesive what this means: it hangs together (the term we use is lithified); thus volcanic ash (from mt. You should be familiar with the rock cycle from eas 100 (fig. 1. 15); if it is truly a cycle then there is hypothetically no beginning to the cycle. However, if we accept that early in its history earth was entirely in the molten state, then the first solid rocks to form would have been igneous rocks, with which we begin our examination of the cycle. Definition:- igneous rocks are formed by cooling and solidification (usually crystallization) of molten material known as magma (characterized: intrusive, plutonic, cooled within the earth"s crust) or lava (characterized: extrusive, volcanic, cooled outside the crust).
