지구 내부구조
... chain that goes through every ocean basin. – Consists of layers upon layers of fractured & uplifted igneous rock. • Not deformed like rocks in continental mountain belts. ...
... chain that goes through every ocean basin. – Consists of layers upon layers of fractured & uplifted igneous rock. • Not deformed like rocks in continental mountain belts. ...
AIM: Introduce you to scientific study of the world`s oceans and seas
... occur where slabs of lithosphere extend to depth •Recognize lithosphere by its relatively high seismic velocity & the relatively low attenuation of seismic waves ...
... occur where slabs of lithosphere extend to depth •Recognize lithosphere by its relatively high seismic velocity & the relatively low attenuation of seismic waves ...
Inner Core - Net Start Class
... The outer core is a liquid layer that is makes up part of Earth’s dense metallic center. If you imagine Earth as a hard-cooked egg, the core is the yolk. If Earth’s crust and mantel are made of rock why is the core made of metal? Recall that in Earth’s early history, the planet was much hotter than ...
... The outer core is a liquid layer that is makes up part of Earth’s dense metallic center. If you imagine Earth as a hard-cooked egg, the core is the yolk. If Earth’s crust and mantel are made of rock why is the core made of metal? Recall that in Earth’s early history, the planet was much hotter than ...
Lesson 2 - Continental Drift Alfred Wegener.key
... called tectonic plates and that mountains are formed when these tectonic plates collide. The idea that the Earth's surface is not stable and is made up of parts that move was first put forward by Alfred Wegener. He proposed a theory known as the theory of continental drift. Wegener said that about 3 ...
... called tectonic plates and that mountains are formed when these tectonic plates collide. The idea that the Earth's surface is not stable and is made up of parts that move was first put forward by Alfred Wegener. He proposed a theory known as the theory of continental drift. Wegener said that about 3 ...
Oceanic Crust
... pulled back into the mantle in subduction zones by the processes of plate tectonics. 2. Most of the present day oceanic crust is less than 200 million years old because it is continuously being recycled. 3. Seafloor spreading forms oceanic crust. ...
... pulled back into the mantle in subduction zones by the processes of plate tectonics. 2. Most of the present day oceanic crust is less than 200 million years old because it is continuously being recycled. 3. Seafloor spreading forms oceanic crust. ...
sea-floor spreading
... Because of this, oceanic crust is being subducted faster than it is being produced. ...
... Because of this, oceanic crust is being subducted faster than it is being produced. ...
here
... lavas that had been erupted along mid-ocean ridges. Symmetric patterns (“stripes”) on either side of spreading center (mid-ocean ridge) indicated that the seafloor was moving in opposing directions, away from the central ridge axis and acting as giant “tape recorder” for magnetic reversals. Chan ...
... lavas that had been erupted along mid-ocean ridges. Symmetric patterns (“stripes”) on either side of spreading center (mid-ocean ridge) indicated that the seafloor was moving in opposing directions, away from the central ridge axis and acting as giant “tape recorder” for magnetic reversals. Chan ...
Lesson 2 - Plate Tectonics - Hitchcock
... What discoveries support the idea of continental drift? • For many years, scientists did not accept Wegener’s ideas because they could not determine how continents moved. • In the mid-1900s, scientists began mapping the sea floor and discovered huge, underwater mountain ranges called mid-ocean ridge ...
... What discoveries support the idea of continental drift? • For many years, scientists did not accept Wegener’s ideas because they could not determine how continents moved. • In the mid-1900s, scientists began mapping the sea floor and discovered huge, underwater mountain ranges called mid-ocean ridge ...
Unit 4 Lesson 2 Plate Tectonics
... What discoveries support the idea of continental drift? • For many years, scientists did not accept Wegener’s ideas because they could not determine how continents moved. • In the mid-1900s, scientists began mapping the sea floor and discovered huge, underwater mountain ranges called mid-ocean ridge ...
... What discoveries support the idea of continental drift? • For many years, scientists did not accept Wegener’s ideas because they could not determine how continents moved. • In the mid-1900s, scientists began mapping the sea floor and discovered huge, underwater mountain ranges called mid-ocean ridge ...
What are the layers of the Earth? What are the characteristics of
... • The layer of Earth beneath the crust is called the mantle. • Approximately 67% of Earth’s mass is found in this layer. • The top boundary, the MOHO, is made up of solid rock. In the center of the mantle, the rock is viscous..it ...
... • The layer of Earth beneath the crust is called the mantle. • Approximately 67% of Earth’s mass is found in this layer. • The top boundary, the MOHO, is made up of solid rock. In the center of the mantle, the rock is viscous..it ...
APES – Earth Systems
... Spreading oceanic plates result in formation of new crust on the ocean’s bottom (“seafloor spreading”) and subduction of heavier oceanic plates beneath less dense continental plates. ...
... Spreading oceanic plates result in formation of new crust on the ocean’s bottom (“seafloor spreading”) and subduction of heavier oceanic plates beneath less dense continental plates. ...
EVIDENCE TO THE CONTRARY (CHAPTER 6)
... • The outer edge of the continental margin is defined by the transition between continental and oceanic crust • The landward limit of this transition zone may be considered as an equivalent to the foot of the slope ...
... • The outer edge of the continental margin is defined by the transition between continental and oceanic crust • The landward limit of this transition zone may be considered as an equivalent to the foot of the slope ...
Laboratory Title: Plate Tectonics
... pulls the plate apart in the middle, forming what is called a "spreading center" or "mid-ocean ridge," shown at middle. Where continental plates collide, they crunch together and form mountains and cause earthquakes. When the edge of a cold, rocky oceanic plate sinks into the mantle under a continen ...
... pulls the plate apart in the middle, forming what is called a "spreading center" or "mid-ocean ridge," shown at middle. Where continental plates collide, they crunch together and form mountains and cause earthquakes. When the edge of a cold, rocky oceanic plate sinks into the mantle under a continen ...
Mountain Belts
... Ages of Mountain Belts and Continents • Higher mountain ranges tend to be geologically younger • Appalachians are much older than the North American Cordillera • Ancient mountain belts have eroded nearly flat to form the stable cores (cratons) of the continents • Precambrian Shield – Precambrian met ...
... Ages of Mountain Belts and Continents • Higher mountain ranges tend to be geologically younger • Appalachians are much older than the North American Cordillera • Ancient mountain belts have eroded nearly flat to form the stable cores (cratons) of the continents • Precambrian Shield – Precambrian met ...
Name: Class: Date: Convergent Boundaries (All answers must be in
... after its formation 4.6 billion years ago. The Earth's unchanging size implies that the crust must be destroyed at about the same rate as it is being created, as Harry Hess surmised. Such destruction (recycling) of crust takes place along convergent boundaries where plates are moving toward each oth ...
... after its formation 4.6 billion years ago. The Earth's unchanging size implies that the crust must be destroyed at about the same rate as it is being created, as Harry Hess surmised. Such destruction (recycling) of crust takes place along convergent boundaries where plates are moving toward each oth ...
CHAPTER 2 Plate Tect..
... 1. Students should be aware of Wegener’s amassed evidence for continental drift. The fit of coastal outlines and the distribution of rocks, fossils, and ancient climatic belts all strongly suggest that the continents were once aligned to form a supercontinent named Pangaea. Wegener’s ideas had few s ...
... 1. Students should be aware of Wegener’s amassed evidence for continental drift. The fit of coastal outlines and the distribution of rocks, fossils, and ancient climatic belts all strongly suggest that the continents were once aligned to form a supercontinent named Pangaea. Wegener’s ideas had few s ...
Did PT begin in Early Archean time?
... with nappe-like folding accompanied by voluminous granite magmatism 1989: Nutman et al. Recognised that "homogeneous grey gneisses” had variable geochronologic and isotopic histories, and could be divided into distinct terranes separated by thin mylonite zones 1997: Nutman et al. Recognised that Isu ...
... with nappe-like folding accompanied by voluminous granite magmatism 1989: Nutman et al. Recognised that "homogeneous grey gneisses” had variable geochronologic and isotopic histories, and could be divided into distinct terranes separated by thin mylonite zones 1997: Nutman et al. Recognised that Isu ...
Magnesium isotopic composition of the lower continental crust
... The large isotope fractionation during low-temperature waterrock interactions and limited fractionation during igneous differentiation make Mg isotopes a potentially powerful tracer of the influence of chemical weathering on the continental crust composition. Magnesium isotopic composition of the up ...
... The large isotope fractionation during low-temperature waterrock interactions and limited fractionation during igneous differentiation make Mg isotopes a potentially powerful tracer of the influence of chemical weathering on the continental crust composition. Magnesium isotopic composition of the up ...
Sea Levels - MSU Billings
... crust, which has an average composition of granite. vs. Deep-ocean basin = the deep sea floor beyond the continental margin; made up of oceanic crust, which is composed mostly of volcanic basalt. ...
... crust, which has an average composition of granite. vs. Deep-ocean basin = the deep sea floor beyond the continental margin; made up of oceanic crust, which is composed mostly of volcanic basalt. ...
View PDF - Goldschmidt Conference Archive
... School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China (*correspondence: zfzhao@ustc.edu.cn) Plate subduction is an important mechanism for exchanging the mass and energy between the mantle and the crust, and igneous rocks above subduction zones are an ...
... School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China (*correspondence: zfzhao@ustc.edu.cn) Plate subduction is an important mechanism for exchanging the mass and energy between the mantle and the crust, and igneous rocks above subduction zones are an ...
Magma Type and Plate Margins
... Explain the relationship between igneous activity, magmatic composition, rock types and plate boundaries. ...
... Explain the relationship between igneous activity, magmatic composition, rock types and plate boundaries. ...
Seafloor Spreading
... hypothesis that the Earth’s crust is broken up into several pieces, called lithospheric plates, and that the plates are slowly moving which changes the geographic appearance of Earth’s surface. Here is how plate tectonics works. As discovered during the investigation of seafloor spreading, new seafl ...
... hypothesis that the Earth’s crust is broken up into several pieces, called lithospheric plates, and that the plates are slowly moving which changes the geographic appearance of Earth’s surface. Here is how plate tectonics works. As discovered during the investigation of seafloor spreading, new seafl ...
Hyperextended continental margins—Knowns and
... common mode of continental break-up (e.g., the South Atlantic, Heine et al., 2013; Central Atlantic, Kneller and Johnson, 2011, and North Atlantic oceans; Sibuet et al., 2012). Tugend et al. show how this margin evolved as partitioned transtensional domains along the nascent plate boundary and, perh ...
... common mode of continental break-up (e.g., the South Atlantic, Heine et al., 2013; Central Atlantic, Kneller and Johnson, 2011, and North Atlantic oceans; Sibuet et al., 2012). Tugend et al. show how this margin evolved as partitioned transtensional domains along the nascent plate boundary and, perh ...
Hyperextended continental margins—Knowns and
... common mode of continental break-up (e.g., the South Atlantic, Heine et al., 2013; Central Atlantic, Kneller and Johnson, 2011, and North Atlantic oceans; Sibuet et al., 2012). Tugend et al. show how this margin evolved as partitioned transtensional domains along the nascent plate boundary and, perh ...
... common mode of continental break-up (e.g., the South Atlantic, Heine et al., 2013; Central Atlantic, Kneller and Johnson, 2011, and North Atlantic oceans; Sibuet et al., 2012). Tugend et al. show how this margin evolved as partitioned transtensional domains along the nascent plate boundary and, perh ...
Supercontinent
In geology, a supercontinent is the assembly of most or all of the Earth's continental blocks or cratons to form a single large landmass. However, the definition of a supercontinent can be ambiguous. Many tectonicists such as P.F. Hoffman (1999) use the term ""supercontinent"" to mean ""a clustering of nearly all continents"". This definition leaves room for interpretation when labeling a continental body and is easier to apply to Precambrian times. Using the first definition provided here, Gondwana (aka Gondwanaland) is not considered a supercontinent, because the landmasses of Baltica, Laurentia and Siberia also existed at the same time but physically separate from each other. The landmass of Pangaea is the collective name describing all of these continental masses when they were in a close proximity to one another. This would classify Pangaea as a supercontinent. According to the definition by Rogers and Santosh (2004), a supercontinent does not exist today. Supercontinents have assembled and dispersed multiple times in the geologic past (see table). The positions of continents have been accurately determined back to the early Jurassic. However, beyond 200 Ma, continental positions are much less certain.