Earthquakes are concentrated along oceanic ridges, transform faults
... • Seismicity and volcanism are concentrated along plate boundaries. • Movement of plates is caused by thermal convection of the “plastic” rocks of the asthenosphere that drag along the overlying lithospheric plates. ...
... • Seismicity and volcanism are concentrated along plate boundaries. • Movement of plates is caused by thermal convection of the “plastic” rocks of the asthenosphere that drag along the overlying lithospheric plates. ...
Unit 1
... & earthquake activity. ii. Convergent boundaries create trenches. 1. Where two continental plates meet, there is a build-up of crust into mountain ranges such as the Himalayan Mountains in Asia. 2. Where a thicker continental plate meets a thinner oceanic plate, a subduction zone exists. This subduc ...
... & earthquake activity. ii. Convergent boundaries create trenches. 1. Where two continental plates meet, there is a build-up of crust into mountain ranges such as the Himalayan Mountains in Asia. 2. Where a thicker continental plate meets a thinner oceanic plate, a subduction zone exists. This subduc ...
Plate Tectonics
... Example - the idea of a super continent called Pangaea that existed millions of years ago. ...
... Example - the idea of a super continent called Pangaea that existed millions of years ago. ...
The Earth`s Plates Most earthquakes are caused by large
... The plates are in very slow but constant motion, so that seen from above, the Earth's surface might look like a slowly moving spherical jigsaw puzzle. The plates move at rates of 2 to 15 cm or several inches in a year, about as fast as our fingernails grow. On a human scale, this is a rate of moveme ...
... The plates are in very slow but constant motion, so that seen from above, the Earth's surface might look like a slowly moving spherical jigsaw puzzle. The plates move at rates of 2 to 15 cm or several inches in a year, about as fast as our fingernails grow. On a human scale, this is a rate of moveme ...
The Pacific Ring of Fire
... In the 1960s, Canadian J. Tuzo Wilson got people interested in continental drift again. He recognized that hot spots could form deep in the mantle, and that currents could circulate above these hot spots, just as boiling water swirls in a heated pot on a stove. These convection currents might provid ...
... In the 1960s, Canadian J. Tuzo Wilson got people interested in continental drift again. He recognized that hot spots could form deep in the mantle, and that currents could circulate above these hot spots, just as boiling water swirls in a heated pot on a stove. These convection currents might provid ...
Earth`s interior volc eq4
... Sea Floor Spreading • The process by which new oceanic lithosphere forms as magma rises to the surface and solidifies – Evidence for continental drift ...
... Sea Floor Spreading • The process by which new oceanic lithosphere forms as magma rises to the surface and solidifies – Evidence for continental drift ...
The Earth’s Interior
... The continental crust is the portion of Earth's crust that makes up the continents. ...
... The continental crust is the portion of Earth's crust that makes up the continents. ...
plate tectonics brochure - University of Southern California
... oceanic plate, because of its higher density, is thrusted underneath the continental plate. This is called subduction. A surface feature associated with subduction is a trench that forms at the boundary where subduction occurs. During subduction, as the crust subducts, it becomes hot, melts, and the ...
... oceanic plate, because of its higher density, is thrusted underneath the continental plate. This is called subduction. A surface feature associated with subduction is a trench that forms at the boundary where subduction occurs. During subduction, as the crust subducts, it becomes hot, melts, and the ...
Plate Tectonics - Welcome to Ms. Duff's Classroom!
... between the two plates, forcing the two plates apart and creating mid-oceanic mountain ridges as it cools and solidifies. At the mid-oceanic ridges new crust is created. But Earth’s crust is in balance, so that as new crustal material is created, old crust is “removed”. This happens at the trenches, ...
... between the two plates, forcing the two plates apart and creating mid-oceanic mountain ridges as it cools and solidifies. At the mid-oceanic ridges new crust is created. But Earth’s crust is in balance, so that as new crustal material is created, old crust is “removed”. This happens at the trenches, ...
Tectonics Quiz Topics
... Evidence of sea floor spreading shows that the ocean plates have moved away from the mid-ocean ridges over time. This has created new oceanic crust and moved the continental plates further apart. Explain how glacial deposits support the theory of plate tectonics. Glacial deposits on different contin ...
... Evidence of sea floor spreading shows that the ocean plates have moved away from the mid-ocean ridges over time. This has created new oceanic crust and moved the continental plates further apart. Explain how glacial deposits support the theory of plate tectonics. Glacial deposits on different contin ...
Earth Science EOG Review
... A.Earthquakes & Volcanoes Plate movements cause most changes in the Earth’s surface. Earthquakes and volcanoes can also cause sudden changes in the Earths surface. ...
... A.Earthquakes & Volcanoes Plate movements cause most changes in the Earth’s surface. Earthquakes and volcanoes can also cause sudden changes in the Earths surface. ...
Go to the following link to start the activity http://www.learner.org
... the oceans is called oceanic crust. Continental crust is thicker — about 20 to 40 miles (35 to 70 km) thick — and usually older than oceanic crust, which is only 4 to 6 miles (7 to 10 km) thick. All the plates have names, usually referring to landmasses, oceans, or regions of the globe where they ...
... the oceans is called oceanic crust. Continental crust is thicker — about 20 to 40 miles (35 to 70 km) thick — and usually older than oceanic crust, which is only 4 to 6 miles (7 to 10 km) thick. All the plates have names, usually referring to landmasses, oceans, or regions of the globe where they ...
Lesson 5 - Plate Boundaries
... transform faults are shallow focus earthquakes. Lithosphere is not created or destroyed at these boundaries. ...
... transform faults are shallow focus earthquakes. Lithosphere is not created or destroyed at these boundaries. ...
Year 4-Tectonic Landscapes Exam Skills 1
... 1- Due to convection currents in the mantle, the two oceanic plates collide. ...
... 1- Due to convection currents in the mantle, the two oceanic plates collide. ...
File
... • A. The solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle ...
... • A. The solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle ...
Standard 2 Objective 1 Handout 2
... • A. The solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle ...
... • A. The solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle ...
Unit 3 study Guide
... 10.) Law of Superposition – older rocks/fossils are on the bottom while younger rocks/fossils are on the top 11.) Epicenter – the location on Earth’s surface directly above the focus, or origin, of an earthquake, and the sudden release of energy stored in rocks 12.) Focus – the point within Earth w ...
... 10.) Law of Superposition – older rocks/fossils are on the bottom while younger rocks/fossils are on the top 11.) Epicenter – the location on Earth’s surface directly above the focus, or origin, of an earthquake, and the sudden release of energy stored in rocks 12.) Focus – the point within Earth w ...
STUDY GUIDE
... D. Modified Mercalli scale 3. The theory of plate tectonics best explains which of the following? A. how and why individual plates on Earth’s crust remain in motion B. what keeps individual plates on Earth’s crust from moving C. causes of destructive geological processes on Earth’s surface D. locati ...
... D. Modified Mercalli scale 3. The theory of plate tectonics best explains which of the following? A. how and why individual plates on Earth’s crust remain in motion B. what keeps individual plates on Earth’s crust from moving C. causes of destructive geological processes on Earth’s surface D. locati ...
Continental Drift - Ms. Mosley
... Under the plates, there is another layer of rock called the mantle. The mantle has two parts. The first part is a rock layer. The second part is made of super-heated rock. The plates float on this super-heated rock, but they don’t float like rafts float in a swimming pool. The melted rock is very th ...
... Under the plates, there is another layer of rock called the mantle. The mantle has two parts. The first part is a rock layer. The second part is made of super-heated rock. The plates float on this super-heated rock, but they don’t float like rafts float in a swimming pool. The melted rock is very th ...
Crust - Cobb Learning
... The crust is composed of two rocks. The continental crust is mostly granite. The oceanic crust is basalt. Basalt is much denser than the granite. Because of this the less dense continents ride on the denser oceanic plates. Moho’s Discontinuity – (yellow line) peridotite. ...
... The crust is composed of two rocks. The continental crust is mostly granite. The oceanic crust is basalt. Basalt is much denser than the granite. Because of this the less dense continents ride on the denser oceanic plates. Moho’s Discontinuity – (yellow line) peridotite. ...
Layers of the Earth Unit 5 ES.7 The student will investigate and
... scientist named Harry Hess proposed a theory that could explain the observations ...
... scientist named Harry Hess proposed a theory that could explain the observations ...
Plate tectonics
Plate tectonics (from the Late Latin tectonicus, from the Greek: τεκτονικός ""pertaining to building"") is a scientific theory that describes the large-scale motion of Earth's lithosphere. This theoretical model builds on the concept of continental drift which was developed during the first few decades of the 20th century. The geoscientific community accepted the theory after the concepts of seafloor spreading were later developed in the late 1950s and early 1960s.The lithosphere, which is the rigid outermost shell of a planet (on Earth, the crust and upper mantle), is broken up into tectonic plates. On Earth, there are seven or eight major plates (depending on how they are defined) and many minor plates. Where plates meet, their relative motion determines the type of boundary; convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along these plate boundaries. The lateral relative movement of the plates typically varies from zero to 100 mm annually.Tectonic plates are composed of oceanic lithosphere and thicker continental lithosphere, each topped by its own kind of crust. Along convergent boundaries, subduction carries plates into the mantle; the material lost is roughly balanced by the formation of new (oceanic) crust along divergent margins by seafloor spreading. In this way, the total surface of the globe remains the same. This prediction of plate tectonics is also referred to as the conveyor belt principle. Earlier theories (that still have some supporters) propose gradual shrinking (contraction) or gradual expansion of the globe.Tectonic plates are able to move because the Earth's lithosphere has greater strength than the underlying asthenosphere. Lateral density variations in the mantle result in convection. Plate movement is thought to be driven by a combination of the motion of the seafloor away from the spreading ridge (due to variations in topography and density of the crust, which result in differences in gravitational forces) and drag, with downward suction, at the subduction zones. Another explanation lies in the different forces generated by the rotation of the globe and the tidal forces of the Sun and Moon. The relative importance of each of these factors and their relationship to each other is unclear, and still the subject of much debate.