Lecture 18.
... cooler, denser crust slips beneath less dense crust; strong quakes, deep trench forms in arc shape; subducted plate heats in upper mantle; magma rises to form curving chains of volcanic islands. Deep marine trenches are typically associated with subduction zones, and the basins that develop along th ...
... cooler, denser crust slips beneath less dense crust; strong quakes, deep trench forms in arc shape; subducted plate heats in upper mantle; magma rises to form curving chains of volcanic islands. Deep marine trenches are typically associated with subduction zones, and the basins that develop along th ...
Wegener—Continental Drift
... D. Deep ocean studies showing no zones of movement on the ocean floor. ...
... D. Deep ocean studies showing no zones of movement on the ocean floor. ...
The Structure of the Earth and Plate Tectonics
... underneath the continental lithosphere • Oceanic lithosphere heats and dehydrates as it subsides • The melt rises forming volcanism • E.g. The Andes ...
... underneath the continental lithosphere • Oceanic lithosphere heats and dehydrates as it subsides • The melt rises forming volcanism • E.g. The Andes ...
Plate Tectonics 10.2
... drift and sea-floor spreading led to the development of a theory called plate tectonics. • Plate tectonics: Theory that Earth's outer shell is divided into several plates that are in motion (glide) over the mantle • Helps explains why and how continents move and is the study of the formation of feat ...
... drift and sea-floor spreading led to the development of a theory called plate tectonics. • Plate tectonics: Theory that Earth's outer shell is divided into several plates that are in motion (glide) over the mantle • Helps explains why and how continents move and is the study of the formation of feat ...
ContinentalDrift
... Some of the plates are pushing together – these are called converging plates Some of the plates are pulling apart – these are called diverging plates Some plates slide past one another – transform plate boundary ...
... Some of the plates are pushing together – these are called converging plates Some of the plates are pulling apart – these are called diverging plates Some plates slide past one another – transform plate boundary ...
Theory of Plate Tectonics
... Theory of Plate Tectonics • The lithosphere is broken into separate sections called plates • The theory of plate tectonics states that the pieces of Earth’s lithosphere are in constant slow motion driven by convection currents in the mantle. • No plate can move without affecting the other plates. As ...
... Theory of Plate Tectonics • The lithosphere is broken into separate sections called plates • The theory of plate tectonics states that the pieces of Earth’s lithosphere are in constant slow motion driven by convection currents in the mantle. • No plate can move without affecting the other plates. As ...
Study Guide: Earth has Several Layers: (Test on Tuesday 20, 2011)
... Study Guide: Earth has Several Layers: (Test on Tuesday 20, 2011) 8. Define all of the following vocabulary words: inner core, outer core, mantle, crust, lithosphere, anthenosphere, and tectonic plate. 9. Be able to draw the earth and its many layers along with labeling them. 10. Know the characteri ...
... Study Guide: Earth has Several Layers: (Test on Tuesday 20, 2011) 8. Define all of the following vocabulary words: inner core, outer core, mantle, crust, lithosphere, anthenosphere, and tectonic plate. 9. Be able to draw the earth and its many layers along with labeling them. 10. Know the characteri ...
Plate Margin
... Tectonic Activity and Plate Margins– in the right hand column add EXTRA case studies in the empty spaces (with thanks to D McGuinness) Plate Margin NAME Constructive (Spreading or Divergent margins) ...
... Tectonic Activity and Plate Margins– in the right hand column add EXTRA case studies in the empty spaces (with thanks to D McGuinness) Plate Margin NAME Constructive (Spreading or Divergent margins) ...
ppt file - Angelfire
... ocean called the Tethys Ocean were sat on a tectonic plate. This plate was moving northwards towards Asia at a rate of 10 centimeters per year. The Tethys oceanic crust was being subducted under the Asian Continent. The ocean got progressively smaller until about 55 milion years ago when India 'hit' ...
... ocean called the Tethys Ocean were sat on a tectonic plate. This plate was moving northwards towards Asia at a rate of 10 centimeters per year. The Tethys oceanic crust was being subducted under the Asian Continent. The ocean got progressively smaller until about 55 milion years ago when India 'hit' ...
Ch. 10 Earth Science Study Guide The youngest rocks on the ocean
... samples of older rock found far from mid-ocean ridges ...
... samples of older rock found far from mid-ocean ridges ...
Handout 2.3-1 Standard 2 Objective 3.a, b, c, and d
... encircles the Pacific Ocean is known as the • Pacific Ring of Fire ...
... encircles the Pacific Ocean is known as the • Pacific Ring of Fire ...
Class Notes: Introduction to Earthquakes, Volcanoes, and Tectonic
... surface? If not, describe where there appear to be the most… B. Look at the “Earth’s fractured surface” map and read the introduction (back of the classroom on the bulletin board. Why do earthquakes and volcanoes occur where they do? C. If time allows, work on coloring in the “slice of earth” handou ...
... surface? If not, describe where there appear to be the most… B. Look at the “Earth’s fractured surface” map and read the introduction (back of the classroom on the bulletin board. Why do earthquakes and volcanoes occur where they do? C. If time allows, work on coloring in the “slice of earth” handou ...
Geological History
... • Isostasy- The crust floats on the mantle since the crust is less dense. • The heavier the crust, the more it will push on the mantle • Mantle is not “liquid” like we think of it…it has plasticity. ...
... • Isostasy- The crust floats on the mantle since the crust is less dense. • The heavier the crust, the more it will push on the mantle • Mantle is not “liquid” like we think of it…it has plasticity. ...
Learning Assessment #1
... provided with the handout. Also make sure that on your cross section you have labeled or indicated the following: • The names of the tectonic plates (place the name label them above the cross section and make sure you indicate with a vertical line the edges of the plate that extends from the plate b ...
... provided with the handout. Also make sure that on your cross section you have labeled or indicated the following: • The names of the tectonic plates (place the name label them above the cross section and make sure you indicate with a vertical line the edges of the plate that extends from the plate b ...
How Australia was formed – Geographical
... The Earth is made up of many layers. From the outside in, they are the crust, the mantle, the outer core and the inner core. Central to the theory of tectonic plates is the idea that the outermost part of the Earth, the crust, is composed of two layers: the lithosphere and the asthenosphere. The lit ...
... The Earth is made up of many layers. From the outside in, they are the crust, the mantle, the outer core and the inner core. Central to the theory of tectonic plates is the idea that the outermost part of the Earth, the crust, is composed of two layers: the lithosphere and the asthenosphere. The lit ...
plate_tectonics
... Theory of Plate Tectonics Earth’s crust is composed of large plates These plates float on the mantle below These plates have always moved (slowly) ...
... Theory of Plate Tectonics Earth’s crust is composed of large plates These plates float on the mantle below These plates have always moved (slowly) ...
File
... Cools under ground slowly from magma allowing large cristals to grow. Contains mostly Silica with at least 20% Quartz. ...
... Cools under ground slowly from magma allowing large cristals to grow. Contains mostly Silica with at least 20% Quartz. ...
Theory of Plate Tectonics
... less dense continental plate • Subduction Zone: where the less dense plate slides under the more dense plate • VOLCANOES occur at subduction zones ...
... less dense continental plate • Subduction Zone: where the less dense plate slides under the more dense plate • VOLCANOES occur at subduction zones ...
1 0 .
... 10. Lithosphere – Movements of Tectonic Plates The Earth’s Crust was divided into many segments – litospheric (tectonic) plates. These plates are moving. The speed of this movement is 1 – 5 cm per year. Crustal plates can converge, diverge, collide with each other, slide under each other or move hor ...
... 10. Lithosphere – Movements of Tectonic Plates The Earth’s Crust was divided into many segments – litospheric (tectonic) plates. These plates are moving. The speed of this movement is 1 – 5 cm per year. Crustal plates can converge, diverge, collide with each other, slide under each other or move hor ...
Plate Tectonics Bingo - Western Reserve Public Media
... something down (as by particles washing over it) Eruption: When ash and lava flows and gases are ejected from deep within the earth Fault: An area of stress in the earth where broken rocks slide past each other, causing a crack in the Earth’s surface Igneous rock: Rock that is formed when magma cool ...
... something down (as by particles washing over it) Eruption: When ash and lava flows and gases are ejected from deep within the earth Fault: An area of stress in the earth where broken rocks slide past each other, causing a crack in the Earth’s surface Igneous rock: Rock that is formed when magma cool ...
Plate: a rigid slab of solid lithosphere rock that has defined
... a rigid slab of solid lithosphere rock that has defined boundaries and floats on the denser rocks of the asthenosphere a point on the earth’s surface where strong upward convection currents or plumes of hot magma in the upper mantle push up below the plates of the lithosphere causing volcanic ...
... a rigid slab of solid lithosphere rock that has defined boundaries and floats on the denser rocks of the asthenosphere a point on the earth’s surface where strong upward convection currents or plumes of hot magma in the upper mantle push up below the plates of the lithosphere causing volcanic ...
Earth Science Unit
... The major problem of Wegener’s theory of continental drift is that ____________ ________________________________________________________________ ...
... The major problem of Wegener’s theory of continental drift is that ____________ ________________________________________________________________ ...
Notes #5 Plate tectonics
... volcanoes, in which a linear series of fissures in the volcanic edifice allows lava to be erupted from the volcano's flank instead of from its summit ...
... volcanoes, in which a linear series of fissures in the volcanic edifice allows lava to be erupted from the volcano's flank instead of from its summit ...
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.