intrusive rocks harden slowly beneath the surface of the earth‚ and often form large mineral crystals within the rock. Granite is a good example of an intrusive rock.Porphyritic intrusive rocks have large crystals embedded in a matrix of smaller crystals. Pegmatite is the only porphyritic rock on the Science Olympiad list.Extrusive rocks harden quickly during a volcanic eruption and are usually smooth-grained. Basalt is the most common form of extrusive rock. |IgneousName |Classification|Description
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The History of Punk Rock What comes to your mind when you hear the word “punk?” Do you think of a violent‚ attention-seeking young person‚ or do you think of a rebellious teenager who is trying to go against the mainstream society? “Punk is about being 16 and saying no.” According to Encarta Dictionary: English‚ punk is a youth movement of the late 1970s‚ characterized by loud aggressive rock music‚ confrontational attitudes‚ body piercing‚ and unconventional hairstyles‚ makeup‚ and clothing
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table salt (halite). Identifying Minerals Minerals have many different properties‚ and geologists use these properties to determine what kind of mineral is before them. Scientists use a combination of properties to distinguish between these minerals‚ using the process of elimination. More on the physical properties of minerals. The following is a description of each of these properties: 1.Color- Color is usually the first property observed when handling a specimen. Color
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First off you should know what a rock cycle is. The rock cycle is a fundamental concept in geology that describes the dynamic transitions through geologic time among the three main rock types: sedimentary‚ metamorphic‚ and igneous. Rocks make rocks. The cycle begins within the core of the earth. The molten rock in the core of the earth is called magma. Once the rock is forced to the earth’s lithosphere or crust‚ the molten rock becomes lava and thereby begins its long journey of development
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their fair share of uses. One of the most interesting theories that cannot be observed is the Moon’s magnetic field‚ and why there is not one anymore. Moon rocks Colwell 7 brought back from the Apollo age astronauts shows that at some point the moon did have a magnetic field as strong as the Earth’s at some point. From analyzing the way the rock formed‚ the scientists can determine how long the Moon had a magnetic field. From their research they have discovered that a magnetic field persisted for much
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About the Igneous rocks: The Igneous rocks are the oldest type of rocks among all. The word "Igneous" comes from a Greek word which means fire. In the deepest part of the Earth‚ the minerals are found in a liquid form‚ which is known as magma. When the magma pushes towards the surface of the Earth‚ it starts to get cool and converts into the solid Igneous rocks. The formation of Igneous Rocks: The Igneous rocks are known as the fire rocks and these are generally formed underground or above the
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Parks Victoria The Place To Be? | | | | | | | | | | | | | | | | | | | | | Executive Summary This Report was commissioned to examine the needs‚ wants and satisfaction levels associated with international visitors who visit national parks in throughout Victoria. The research draws attention to ways in which Parks Victoria’s can increase nature based tourism. Our aim was to develop and test a questionnaire for collecting the data‚ which provides a suitable
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Write a 500- to 750-word explanation regarding the role of plate tectonics in the origin of igneous rocks. To begin‚ igneous rocks come from magma‚ and magma is related to plate tectonics. Magmas differ in composition‚ temperature and viscosity. This is a major identifier of igneous rocks‚ is that they were once molten and magma Plate tectonics are the theory that the Earth’s lithosphere‚ which is the outer rigid shell is composed of several different pieces‚ or “plates” that float on a ductile
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THE ROCK CYCLE ● ● ● ● There are three main types of rocks: igneous‚ sedimentary‚ and metamorphic. Each of these types of rocks are formed in different ways and each type of rock can be changed into the other types of rock. This process is called the Rock Cycle. The rock cycle is the process that makes and recycles rocks. IGNEOUS ROCKS ● ● ● ● ● ● Igneous rocks are formed from magma. Magma cools and solidifies into rock. When igneous rocks are exposed on the surface‚ time and weather break the
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A metamorphic Rock can be formed by simply being under the earth’s surface‚ being exposed to extremely high temperatures and a huge amount of pressure from the layers of rock above. These rocks can be formed by tectonic processes‚ some which include‚ continental collisions (this is a process that causes friction‚ distortion and horizontal pressure). These rocks can also be formed when rock becomes heated rapidly by the intrusion of a hot molten rock‚ (called magma) and it comes from the earth’s interior
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