Oceanic crust
... • The first continental rocks were the result of repeated melting, cooling, and remixing of oceanic crust, driven by volcanic activity above mantle convection cells, which were much more numerous and vigorous than today’s. • Geologists believe that the major continental cores were formed by the earl ...
... • The first continental rocks were the result of repeated melting, cooling, and remixing of oceanic crust, driven by volcanic activity above mantle convection cells, which were much more numerous and vigorous than today’s. • Geologists believe that the major continental cores were formed by the earl ...
Theory of Plate Tectonics
... which has become denser as a result of cooling, descends below another plate creating a deepsea trench. – The subducted plate descends into the mantle and melts. – Some of the magma forms new oceanic crust at the ridge or is forced back to the surface, forming an arc of volcanic islands that paralle ...
... which has become denser as a result of cooling, descends below another plate creating a deepsea trench. – The subducted plate descends into the mantle and melts. – Some of the magma forms new oceanic crust at the ridge or is forced back to the surface, forming an arc of volcanic islands that paralle ...
Lesson 2 Power Point - Plain Local Schools
... “Volcanic rocks are formed from lava that flows on the surface of the Earth and other planets and then cools and solidifies” (Arizona, 2007, p. 1) It is important to look at texture of rocks. All rocks have different characteristics ...
... “Volcanic rocks are formed from lava that flows on the surface of the Earth and other planets and then cools and solidifies” (Arizona, 2007, p. 1) It is important to look at texture of rocks. All rocks have different characteristics ...
Unit 4: The Rock Cycle - Ann Arbor Earth Science
... Plate Tectonics* We have learned that igneous rocks are formed by the cooling and hardening of hot, molten rock from inside the Earth. Two possible plate tectonic “areas” can produce the necessary magma. The first are divergent boundaries. Many of these are found around the ocean floor. ...
... Plate Tectonics* We have learned that igneous rocks are formed by the cooling and hardening of hot, molten rock from inside the Earth. Two possible plate tectonic “areas” can produce the necessary magma. The first are divergent boundaries. Many of these are found around the ocean floor. ...
First Exam, Spring 2013 Geology 1- Gavilan College
... b. hotspots c. convergent d. transform e. passive margin 25. Which of these describes the current theory of plate tectonics? a. it combines elements of continental drift and seafloor spreading. b. it helps explain the location of volcanoes and earthquakes. c. it suggests that the lithosphere is divi ...
... b. hotspots c. convergent d. transform e. passive margin 25. Which of these describes the current theory of plate tectonics? a. it combines elements of continental drift and seafloor spreading. b. it helps explain the location of volcanoes and earthquakes. c. it suggests that the lithosphere is divi ...
The Theory of Continental Drift
... Thailand. People had no warning. More than 250,000 lives were lost. Just a few years back, another tsunami, triggered by an under-ocean earthquake, struck Japan. Here is a 3-minute video to show you the power of these giant waves. ...
... Thailand. People had no warning. More than 250,000 lives were lost. Just a few years back, another tsunami, triggered by an under-ocean earthquake, struck Japan. Here is a 3-minute video to show you the power of these giant waves. ...
dynamic planet: earthquakes, volcanoes, and plate tectonics
... overlaying rock layers they solidify to form land forms we call dikes if they cut across layers of overlying rock and sills if the run between overlying layers of rock. However the largest intrusive igneous bodies are batholiths, hundreds of km long and up to 100 km wide and they form as plutons mer ...
... overlaying rock layers they solidify to form land forms we call dikes if they cut across layers of overlying rock and sills if the run between overlying layers of rock. However the largest intrusive igneous bodies are batholiths, hundreds of km long and up to 100 km wide and they form as plutons mer ...
Plate Tectonics
... Whiteboard Practice • What do Convergent Boundaries create when it’s two continental plates? • Mountains! • What do Convergent Boundaries create when its an oceanic and continental plate? • Subduction Zone • What type of boundary created mid-oceanic ridges? • Divergent ...
... Whiteboard Practice • What do Convergent Boundaries create when it’s two continental plates? • Mountains! • What do Convergent Boundaries create when its an oceanic and continental plate? • Subduction Zone • What type of boundary created mid-oceanic ridges? • Divergent ...
Typical shield volcano Mauna Loa, Hawaii
... Dike near Duluth Minnesota Plutonic igneous activity • Types of intrusive igneous features • Sill – a tabular, concordant pluton • - example in Ontario ...
... Dike near Duluth Minnesota Plutonic igneous activity • Types of intrusive igneous features • Sill – a tabular, concordant pluton • - example in Ontario ...
GEOL 1010 - Research at UVU
... melting temperatures than felsic minerals). The removal of mafic minerals from the magma leaves it depleted in those elements and enriched in Si (silicon). ii) Assimilation occurs when felsic rock from the crust the magma is rising through is melted and incorporated into the magma. This makes the ma ...
... melting temperatures than felsic minerals). The removal of mafic minerals from the magma leaves it depleted in those elements and enriched in Si (silicon). ii) Assimilation occurs when felsic rock from the crust the magma is rising through is melted and incorporated into the magma. This makes the ma ...
d3 - e-Geowords
... familiar rocks do not extend to great depth. He had just finished equipping a seismic observatory in Zagreb when at some remove an earthquake occurred that his station and others could record.4 Note: seismic wave velocity increases with rock rigidity (which is a proxy for rock density). The arrival ...
... familiar rocks do not extend to great depth. He had just finished equipping a seismic observatory in Zagreb when at some remove an earthquake occurred that his station and others could record.4 Note: seismic wave velocity increases with rock rigidity (which is a proxy for rock density). The arrival ...
File
... Himalayas formed when the Indian plate and the Eurasian Plate collide and this area experiences earthquake activity. As the plates collide land is uplifted and shallow quakes occur whose focus is less than 70 kilometres below the earth’s surface. These quakes may not rate highly on the Richter Scale ...
... Himalayas formed when the Indian plate and the Eurasian Plate collide and this area experiences earthquake activity. As the plates collide land is uplifted and shallow quakes occur whose focus is less than 70 kilometres below the earth’s surface. These quakes may not rate highly on the Richter Scale ...
Rock cycle and Rocks made simple
... http://www.windows2universe.org/earth/geology/rocks_intro.html You can also find the same information in the ‘Rock cycle’ program. Use this program and give at least two examples for each type of rock that you are learning about. Write a short description for each type of rock. 1. Sedimentary rocks ...
... http://www.windows2universe.org/earth/geology/rocks_intro.html You can also find the same information in the ‘Rock cycle’ program. Use this program and give at least two examples for each type of rock that you are learning about. Write a short description for each type of rock. 1. Sedimentary rocks ...
Chapter 6: Volcanoes Study Guide
... 11. Circle the letter of the types of plates that collided to form the Andes Mountains on the west coast of South America. a. two oceanic plates b. a continental plate and an oceanic plate c. a continental plate and an island plate d. two continental plates. 12. A ______________ ________________ is ...
... 11. Circle the letter of the types of plates that collided to form the Andes Mountains on the west coast of South America. a. two oceanic plates b. a continental plate and an oceanic plate c. a continental plate and an island plate d. two continental plates. 12. A ______________ ________________ is ...
Plate Tectonics: The General Theory
... even from normal temperature or isothermal mantle. Thus, fertility and geometry can both generate large volumes of melt with not thermal anomaly. The volume of melting depends on source fertility, composition, focusing, history and EDGE effects (dynamic convection and fluxing of upper mantle through ...
... even from normal temperature or isothermal mantle. Thus, fertility and geometry can both generate large volumes of melt with not thermal anomaly. The volume of melting depends on source fertility, composition, focusing, history and EDGE effects (dynamic convection and fluxing of upper mantle through ...
Crust
... The asthenosphere (or middle mantle) "flows" because of convection currents. Convection currents are caused by the very hot material at the deepest part of the mantle rising, then cooling and sinking again --repeating this cycle over and over. ...
... The asthenosphere (or middle mantle) "flows" because of convection currents. Convection currents are caused by the very hot material at the deepest part of the mantle rising, then cooling and sinking again --repeating this cycle over and over. ...
Basic Geology
... igneous rocks of the upper crust while more dense mafic and ultramafic (iron and magnesium) minerals dominate those of the lower crust magma that solidifies below the Earth’s surface and remains surrounded by older, preexisting rock is called intrusive igneous rock where magma reaches the surface, i ...
... igneous rocks of the upper crust while more dense mafic and ultramafic (iron and magnesium) minerals dominate those of the lower crust magma that solidifies below the Earth’s surface and remains surrounded by older, preexisting rock is called intrusive igneous rock where magma reaches the surface, i ...
Powerpoint
... Hypothesis Geological phenomena associated with continental collisions will create extensive new or enlarged mountain ranges in several regions in the future. ...
... Hypothesis Geological phenomena associated with continental collisions will create extensive new or enlarged mountain ranges in several regions in the future. ...
Plate Boundaries Lithospheric plates move as coherent units
... square kilometers of new seafloor. This mechanism has created the floor of the Atlantic Ocean during the past 160 million years and is appropriately called seafloor spreading. Because seafloor spreading is the dominant process associated with divergent boundaries, these zones are sometimes referred ...
... square kilometers of new seafloor. This mechanism has created the floor of the Atlantic Ocean during the past 160 million years and is appropriately called seafloor spreading. Because seafloor spreading is the dominant process associated with divergent boundaries, these zones are sometimes referred ...
Large igneous province
A large igneous province (LIP) is an extremely large accumulation of igneous rocks, including liquid rock (intrusive) or volcanic rock formations (extrusive), when hot magma extrudes from inside the Earth and flows out. The source of many or all LIPs is variously attributed to mantle plumes or to processes associated with plate tectonics. Types of LIPs can include large volcanic provinces (LVP), created through flood basalt and large plutonic provinces (LPP). Eleven distinct flood basalt episodes occurred in the past 250 million years, creating volcanic provinces, which coincided with mass extinctions in prehistoric times. Formation depends on a range of factors, such as continental configuration, latitude, volume, rate, duration of eruption, style and setting (continental vs. oceanic), the preexisting climate state, and the biota resilience to change.