Rocks. Geology: Slides 22-50
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1 Rocks Geology: Slides 22-50
2 Rocks Catastrophism versus Uniformitarianism Catastrophism The Earth s surface was created by fast drastic changes (called catastrophes) that occurred long ago and do not occur anymore.
3 Uniformitarianism Developed by the father of modern Geology, James Hutton Hutton said that the forces that made the Earth look the way it does are the still occurring today. The present is the key to the past Rocks
4 A group of minerals bound together in some way (How they are bound determines the type of rock that you get.) What is a Rock?
5 What is a Rock? Hutton then used his idea of uniformitarianism to determine how rocks are created. He determined that rocks are made in one of three ways
6 1.) Igneous Rocks Made from molten (melted) rock
7 Sedimentary Rock Made up of pieces of other rocks
8 Metamorphic Rocks Made by changes in other rocks
9 All minerals are rocks, but not all rocks are minerals. Why? Rocks can be organic, minerals can not. Coal and organic limestone are examples of organic rocks.
10 Igneous Rocks Rocks that are created as magma cools and hardens.
11 Igneous Rocks Two types of Igneous Rocks: Intrusive rocks cool underground Extrusive rocks cool above ground Grain Size Intrusive rocks cool more slowly so their crystals grow larger. Extrusive rocks cool more quickly so their crystals are smaller.
12 Intrusive Igneous Rock Extrusive Igneous Rock
13 Magma or Lava Types Igneous Rocks Felsic contains more than 50% silicate material (generally light colored rocks) Mafic contains over 50% iron and magnesium (generally dark colored rocks)
14 Igneous Rocks Texture based on grain size Coarse Grained made of large crystals Intrusive Fine Grained made up of small crystals Glassy no crystals Extrusive Porphyritic made up of both large Both and small crystals Int. and Ext.
15 Igneous Rocks Describe Igneous rocks using: Where it cooled Type of magma or lava Texture of the rock
16
17 Sedimentary Rocks Rocks made from pieces of other rock that have become cemented together.
18 Sedimentary Rocks There are three types of sedimentary rocks based on the way they form.
19 Types of Sedimentary Rocks Clastic Made by other rocks being eroded into sediments. The sediments are then deposited and compacted. Cement then works its way between the sediment particles and creates a rock. Clastic rocks are described by their sorting. Well sorted means all pieces of the rock are similar in size, poorly sorted means that the pieces that make up the rock are different sizes.
20 Chemical Types of Sedimentary Rocks Made as mineral rich water evaporates and the minerals are left behind.
21 Organic Types of Sedimentary Rocks A rock made from the remains of a dead plant or animal. Coal (plants) and organic limestone (animal) are two examples of organic rocks.
22 Sedimentary Features Stratification Made as different types of sediment are layered on top of one another. The different rock types create layers in the rocks. It is only found in clastic sedimentary rocks.
23 Sedimentary Features Fossils Made from the imprint of the hard parts of plants or animals. They are only found in clastic sedimentary rocks.
24 Sedimentary Features Ripple Marks and Mud Cracks Can show what the climate of an area was like during the time of the rock s creation. Ripple Marks are found in rocks that form near water. Mud Cracks form in rocks from very dry, arid regions (deserts)
25 Geodes Sedimentary Features Forms when a rock is hollowed by mineral-rich water and then the water evaporates. As the water evaporates it leaves the minerals behind in the form of mineral crystals within the rock. Eventually the rocks can completely fill with mineral crystals.
26 Metamorphic Rocks Rocks that are created by changes in the rock brought about by heat, pressure or chemical reactions.
27 Types of Metamorphism Contact Metamorphism Created as lava or magma bakes a rock (occurs over a smaller area) Regional Metamorphism Created as pressure crushes a rock (occurs over a large area)
28 Foliation Metamorphic Features Layers within a rock created by pressure.
29 Changes in Rocks caused by Metamorphism The growth of new minerals. The deformation of mineral crystals. The re-crystallization of mineral crystals as larger mineral crystals.
30 Texture Foliated Rock with layers (formed by regional metamorphism) Non-Foliated No layers in the rock (formed by contact metamorphism)
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