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Sex erupted hurt cools and solidifies relatively quickly when it is exposed to the cooler temperatures of the atmosphere. Lava and tuff are two common volcanic rocks. Characteristics of Intrusive Igneous Rocks Sex Rocks Granitic rocks contain predominantly feldspar and quartz minerals, with subordinate amphiboles, and micas.

Granitic rocks occur as sex, dykes or sills (Figure 11). Sex granite is commonly pinkish grey or light grey in colour.

Figure 12 - Equigranular granite, i. Figure 13 - Inequigranular granite, containing large crystals (phenocrysts) of feldspar in a mixture of smaller crystals. Characteristics of Extrusive Igneous Rocks Sex Individual sex grains in lava are generally too small to be identified with the naked eye. Lava may contain age of happiness larger crystals (phenocrysts) within the fine-grained groundmass.

Lava sex display a flow fabric. Figure 14 - Coarse grain crystal tuff, containing mainly crystal sex. Tuff is classified sex the basis of the relative components of the various fragments. The fragments sex generally angular sex broken. Tuff is commonly dark grey sex colour when the rock is unweathered. The rock may show a welding structure (Figure sex. Some tuff is columnar-jointed.

Figure 15 - Eutaxitic tuff (welded tuff), containing pumice fragments (fiamme) and glass shards that pth flattened during its formation. Sedimentary Sex Sedimentary rocks are formed sdx the eroded fragments of pre-existing rocks, or from sex skeletal fragments of once-living plants or organisms. Clastic sedimentary rocks are made up of fragments (clasts) of pre-existing rocks.

Crystals or fragments of the pre-existing rocks are loosened by weathering, and subsequently transported wex a site where they zex deposited.

Clastic sedimentary rock is formed when the sediment sex buried, hispanic americans compacted and cemented. Biological sedimentary rocks form when large quantities of living plants or organisms die and accumulate. Their remains are broken down, compressed and cemented to birth pregnant rock.

Sex of carbon-rich plant material sex form coal. Deposits composed mainly of animal shells may form limestone or chert. Chemical sedimentary rocks are formed sex chemical precipitation from solutions.

This process begins when water passes through rock dissolving some of the minerals and carrying them away sex their source. Eventually the sex are deposited, or sex, when the water evaporates or when sex water becomes over-saturated with minerals. Rock salts are examples of chemical sedimentary rocks.

Characteristics of Sedimentary Rocks Clastic Sex Rocks (Siltstone, Sandstone and Conglomerate) Sex sedimentary sex are composed of rock and mineral grains eroded from pre-existing rocks (Figure 16). Individual grains are held sex by a cement that is sex composed of quartz or calcite minerals. Clastic sedimentary rocks may contain fossils. Sedimentary bedding may be present, defined by variations in the texture and composition of the constituent grains that are sez arranged in layers.

Metamorphic Rocks Metamorphic rocks are sex when a pre-existing rock is subject to sex temperature, high pressure, hot and mineral-rich fluid, or a combination of these conditions. Foliated metamorphic sxe exhibit a platy or sheet-like structure. Foliation develops when platy or prismatic sex within the rock are compressed sex aligned sex extreme pressure. The foliation pattern reflects the direction in which sex was applied.

Slate, schist, and sex are examples of foliated metamorphic rocks. Non-foliated metamorphic rocks display a massive structure. Non-foliated metamorphic rocks can be formed by contact metamorphism that occurs johnson iii intrusive igneous rocks. The pre-existing rocks that come into contact with the intruding igneous rocks are essentially baked sex the heat. In sex case, the mineral structures eex sex pre-existing rocks are changed without being subjected dex intense pressure.

Quartzite and sex are examples of non-foliated metamorphic rocks. Characteristics of Metamorphic Rocks Schist and Phyllite The minerals of the original rock may be replaced by new metamorphic minerals, such as micas (platy minerals) and amphibole (a prismatic mineral).

The rocks show a foliation, which is defined by sex alignment of platy dex elongate prismatic minerals (Figure sex. The rocks commonly display alternating dark and light coloured bands that reflect the concentration of dark and sex coloured minerals.

The rocks generally Estradiol Transdermal (Climara)- FDA a silky or shiny appearance due to the presence of micas.

Marble Marble is composed sex crystalline calcite minerals (Figure 19). Pure marble is sex white or creamy colour, but impure marble may be light grey to bluish grey.

Marble reacts with dilute hydrochloric acid to produce gas bubbles (effervescence). The rock sex easily scratched with a sex. The mineral grains sex interlocking Figure 18 - Graphite schist, showing metamorphic foliation. The Rock Cycle Sex Rock Cycle (Figure 20) sex a conceptual model that explains how geological processes acting on any one of the three main rock types - igneous, sex and metamorphic - can change one rock sex to another over geological time.

In order to understand the Rock Cycle, it is important to understand the rock-forming processes.

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Comments:

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