8.2 Continental Drift Theory and Sea-Floor Spreading
... is the magnetic field that extends from the Earth's interior to where it meets the solar wind, a stream of charged particles emanating from the Sun. Its magnitude at the Earth's surface ranges from 25 to 65 micro Tesla (0.25 to 0.65 Gauss). It is approximately the field of a magnetic dipole tilted a ...
... is the magnetic field that extends from the Earth's interior to where it meets the solar wind, a stream of charged particles emanating from the Sun. Its magnitude at the Earth's surface ranges from 25 to 65 micro Tesla (0.25 to 0.65 Gauss). It is approximately the field of a magnetic dipole tilted a ...
4 - Devon County Council
... constituents. The tourmalinisation has affected not only the contact hornfels but also the outer parts of the intrusion, reddening the granite especially adjacent to joints. The 'shales' at the contact zone demonstrate both the chemical exchanges consequent upon intrusion and the effects upon the gr ...
... constituents. The tourmalinisation has affected not only the contact hornfels but also the outer parts of the intrusion, reddening the granite especially adjacent to joints. The 'shales' at the contact zone demonstrate both the chemical exchanges consequent upon intrusion and the effects upon the gr ...
primary and secondary geological structures
... Terms used to describe the parts of a fold: limb: The two sides of a fold are called limbs. axis: A line drawn along the points of maximum curvature of a layer of a fold. More strictly, it is called hinge line. axial plane: an imaginary plane surface that divides a fold as symmetrically as possibl ...
... Terms used to describe the parts of a fold: limb: The two sides of a fold are called limbs. axis: A line drawn along the points of maximum curvature of a layer of a fold. More strictly, it is called hinge line. axial plane: an imaginary plane surface that divides a fold as symmetrically as possibl ...
Plate tectonics and the origins of resources
... an example. It is found as porphyry-type ore around the margins of the Pacific Ocean. This copper was formed at the subduction zone due to partial melting of the subducting plate as it slides beneath the overriding continental plate (Fig. 3.1). Distribution of Earth‘s resources have been controlled ...
... an example. It is found as porphyry-type ore around the margins of the Pacific Ocean. This copper was formed at the subduction zone due to partial melting of the subducting plate as it slides beneath the overriding continental plate (Fig. 3.1). Distribution of Earth‘s resources have been controlled ...
Igneous Intrusive Powerpoint Notes
... Separation of early-formed ferromagnesian minerals from a magma body increases the silica content of the remaining magma Minerals melt in the reverse order of that in which they crystallize from a magma ...
... Separation of early-formed ferromagnesian minerals from a magma body increases the silica content of the remaining magma Minerals melt in the reverse order of that in which they crystallize from a magma ...
Our AMAZING Planet
... •These circulations are called CONVECTION CURRENTS •Continents are in the CRUST so the movement below them makes the continents move too •This is called CONTINENTAL DRIFT. ...
... •These circulations are called CONVECTION CURRENTS •Continents are in the CRUST so the movement below them makes the continents move too •This is called CONTINENTAL DRIFT. ...
Unit 3 Rocks and Minerals
... Glossary for Rocks and Minerals Mineral – is a naturally occurring solid crystalline substance with a distinct chemical composition and is usually inorganic. Rock – is an assemblage of minerals usually cemented together. It may contain only one type of mineral or many. Rock Type Classification – thi ...
... Glossary for Rocks and Minerals Mineral – is a naturally occurring solid crystalline substance with a distinct chemical composition and is usually inorganic. Rock – is an assemblage of minerals usually cemented together. It may contain only one type of mineral or many. Rock Type Classification – thi ...
Structure of the Earth
... spreading Rocks along rift areas were younger than those farther away. New lava rocks were being laid on either side of the rift ...
... spreading Rocks along rift areas were younger than those farther away. New lava rocks were being laid on either side of the rift ...
What is an earthquake?
... 1. The focus of an earthquake is the point WITHIN the Earth where the earthquake starts. It is the place below the earth’s surface where the rocks tear, come apart, or collide. 2. The epicenter is the location on the EARTH’S SURFACE directly above the focus. Surface waves move outward from the epice ...
... 1. The focus of an earthquake is the point WITHIN the Earth where the earthquake starts. It is the place below the earth’s surface where the rocks tear, come apart, or collide. 2. The epicenter is the location on the EARTH’S SURFACE directly above the focus. Surface waves move outward from the epice ...
Planet Earth - Townley Grammar School
... Describe the common features of igneous, sedimentary and metamorphic rocks, and name some examples of each. Describe the layers that make up the Earth, and name the most common elements found in the crust. Describe continental drift, and use it to explain how similar rocks may be found in different ...
... Describe the common features of igneous, sedimentary and metamorphic rocks, and name some examples of each. Describe the layers that make up the Earth, and name the most common elements found in the crust. Describe continental drift, and use it to explain how similar rocks may be found in different ...
Chapter 19: Earthquakes - Richmond County Schools
... Measuring and locating Earthquakes • Magnitude is a measure of the energy released during a earthquake and can be measured on the Richter Scale. • Intensity is a measure of damage caused by a quake and is measured by the Modified Mercalli Scale – Uses roman numerals – Higher the number the greater ...
... Measuring and locating Earthquakes • Magnitude is a measure of the energy released during a earthquake and can be measured on the Richter Scale. • Intensity is a measure of damage caused by a quake and is measured by the Modified Mercalli Scale – Uses roman numerals – Higher the number the greater ...
Salahaddin University College of Science Geology Department
... 39) You finda rock that hasa fine-grained composition. Looking at it carefully, you see what appear to be clam shell fragments in it.This rock is most likely: A. Intrusive igneous B. Extrusive igneous C. Sedimentary D. Metamorphic 40) For magma to become lava, it has to: A. Come to the Earth’s surfa ...
... 39) You finda rock that hasa fine-grained composition. Looking at it carefully, you see what appear to be clam shell fragments in it.This rock is most likely: A. Intrusive igneous B. Extrusive igneous C. Sedimentary D. Metamorphic 40) For magma to become lava, it has to: A. Come to the Earth’s surfa ...
00258 Guide to CH Building Stone
... Notice the granite setts across the road near Lucombe House (top left in photo). Granite is an igneous rock formed by partial melting deep within the Earth’s crust. The magma was less dense than the surrounding rocks so intruded upwards into the surrounding country rocks above. The magma then cooled ...
... Notice the granite setts across the road near Lucombe House (top left in photo). Granite is an igneous rock formed by partial melting deep within the Earth’s crust. The magma was less dense than the surrounding rocks so intruded upwards into the surrounding country rocks above. The magma then cooled ...
Part B KEY
... would likely have formed. It is a dome. This is because of the general shape of the structure – circular, and because the oldest rocks are in the middle of the structure. 39. Would the type of stress that formed the fault have been compressive, tensional or horizontal shear? There is no indication o ...
... would likely have formed. It is a dome. This is because of the general shape of the structure – circular, and because the oldest rocks are in the middle of the structure. 39. Would the type of stress that formed the fault have been compressive, tensional or horizontal shear? There is no indication o ...
Chapter 10 PowerPoint
... – Magma hits the crust & cools. – Cooling magma sinks dragging the lithospheric plate with it (centimeters.) – Magma sinks into the mantle & reheats. ...
... – Magma hits the crust & cools. – Cooling magma sinks dragging the lithospheric plate with it (centimeters.) – Magma sinks into the mantle & reheats. ...
Igneous Rocks
... Intermediate rocks (diorite-andesite) contain roughly equal amounts of dark- and light-colored minerals Felsic rocks (granite-rhyolite) contain abundant light-colored minerals ...
... Intermediate rocks (diorite-andesite) contain roughly equal amounts of dark- and light-colored minerals Felsic rocks (granite-rhyolite) contain abundant light-colored minerals ...
Words of the Day
... 65). Mafic Igneous Rock: Igneous rock high in dark colored minerals, such as biotite mica and olivine, but low in silica minerals (quartz and feldspar) ...
... 65). Mafic Igneous Rock: Igneous rock high in dark colored minerals, such as biotite mica and olivine, but low in silica minerals (quartz and feldspar) ...
Earth Science Final Exam Study Guide
... a. oceanic ridges c. continental volcanic arcs b. volcanic island arcs d. ocean trenches ...
... a. oceanic ridges c. continental volcanic arcs b. volcanic island arcs d. ocean trenches ...
document
... Intrusions of magma deeper within the crust are insulated. Although the margin of the magma next to the wallrock is chilled (small grain size) and the wallrock is baked, the interior of the magma cools much more slowly = large grain size (phaneritic). Deep intrusive igneous rocks are give the generi ...
... Intrusions of magma deeper within the crust are insulated. Although the margin of the magma next to the wallrock is chilled (small grain size) and the wallrock is baked, the interior of the magma cools much more slowly = large grain size (phaneritic). Deep intrusive igneous rocks are give the generi ...
Mineralogy and Petrology :: 2. Formation of minerals (and rocks)
... In contrast to the above, limestone, rock salt and gypsum are formed primarily by chemical reactions. Dripstone in caves and freshwater limestone of lime-rich streams are produced by the transformation of the transported or adsorbed carbon dioxide content of the water into carbonic acid, which diss ...
... In contrast to the above, limestone, rock salt and gypsum are formed primarily by chemical reactions. Dripstone in caves and freshwater limestone of lime-rich streams are produced by the transformation of the transported or adsorbed carbon dioxide content of the water into carbonic acid, which diss ...
Chapter 7 - Heritage Collegiate
... surrounding rock and add pressure. In this way, new minerals are formed and recrystallization takes place. (The surrounding rocks are baked!). The crystals in the baked rock are not forced to line up, so contact metamorphism typically produces nonfoliated rocks. Chemically active fluids may also pro ...
... surrounding rock and add pressure. In this way, new minerals are formed and recrystallization takes place. (The surrounding rocks are baked!). The crystals in the baked rock are not forced to line up, so contact metamorphism typically produces nonfoliated rocks. Chemically active fluids may also pro ...
Carolina Superterrane
... Two suites of strongly foliated layered gneiss occur in the Carolina superterrane in this area: (1) a felsic quartz biotite feldspar-rich unit, and (2) a mafic gneiss dominated by hornblende, biotite, and feldspar-bearing gneisses. ...
... Two suites of strongly foliated layered gneiss occur in the Carolina superterrane in this area: (1) a felsic quartz biotite feldspar-rich unit, and (2) a mafic gneiss dominated by hornblende, biotite, and feldspar-bearing gneisses. ...
Powerpoint Presentation Physical Geology, 10/e
... Partial melting produces magmas less mafic than their source rocks, because lower melting point minerals are more felsic in composition ...
... Partial melting produces magmas less mafic than their source rocks, because lower melting point minerals are more felsic in composition ...
Problem Set #1 due Mon, 2/09/09 Please answer the following
... Problem sets will be graded on the following scale: 0 (not submitted) 1 (incomplete, poorly written, many errors) 2 (complete with some errors) 3 (well written and no more than 1 or 2 minor errors) ...
... Problem sets will be graded on the following scale: 0 (not submitted) 1 (incomplete, poorly written, many errors) 2 (complete with some errors) 3 (well written and no more than 1 or 2 minor errors) ...
Algoman orogeny
The Algoman orogeny, known as the Kenoran orogeny in Canada, was an episode of mountain-building (orogeny) during the Late Archean Eon that involved repeated episodes of continental collisions, compressions and subductions. The Superior province and the Minnesota River Valley terrane collided about 2,700 to 2,500 million years ago. The collision folded the Earth's crust and produced enough heat and pressure to metamorphose the rock. Blocks were added to the Superior province along a 1,200 km (750 mi) boundary that stretches from present-day eastern South Dakota into the Lake Huron area. The Algoman orogeny brought the Archaen Eon to a close, about 2,500 million years ago; it lasted less than 100 million years and marks a major change in the development of the earth’s crust.The Canadian shield contains belts of metavolcanic and metasedimentary rocks formed by the action of metamorphism on volcanic and sedimentary rock. The areas between individual belts consist of granites or granitic gneisses that form fault zones. These two types of belts can be seen in the Wabigoon, Quetico and Wawa subprovinces; the Wabigoon and Wawa are of volcanic origin and the Quetico is of sedimentary origin. These three subprovinces lie linearly in southwestern- to northeastern-oriented belts about 140 km (90 mi) wide on the southern portion of the Superior Province.The Slave province and portions of the Nain province were also affected. Between about 2,000 and 1,700 million years ago these combined with the Sask and Wyoming cratons to form the first supercontinent, the Kenorland supercontinent.