A9R18EC.tmp 17 - crust: Igneous or magmatic rocks: result...

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Prof. M. Fall - University of Ottawa 17 3 The materials Outline 3.1 Introduction 3.2 Rocks 3.3 The minerals (to be discussed in e Lab) What is a rock? Different types of rocks? Rock cycle? Physical properties of rocks? Objectives 3.2 Rocks What is a rock? From geotechnical point of view, the rock is a naturally occurring aggregate of minerals. The rock has a very high cohesion so that the grains can not be separated by a slight mechanical action. 3.2 Rocks 3.2 The rocks What is a rock? Different types of rocks? Rock cycle? Physical properties of rocks? Objectives Different types of rocks? (2) Depending on their origin, 3 categories of rock can be identified. These rocks form the earth’s
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Unformatted text preview: crust: Igneous or magmatic rocks: result from cooling of the magma Sedimentary rocks result from weathering of the rocks (magmatic, metamorphic, sedimentary) Metamorphic rocks result from physico-chemical transformation of old rocks 3.2 Rocks Different types of rocks? (3) The igneous rocks or magmatic : they come from a mass in fusion which was then solidified . The place and the moment when they consolidated confer them various properties what enables us to subdivide them in 2 major classes.: b A) The extrusive igneous rocks b B) The intrusive igneous rocks. 3.2 Rocks...
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