d45 plate boundaries ppt
... • The map on p D42 shows the locations of earthquakes and volcanoes on Earth. • Many of the most active volcanoes are on the edges of the Pacific Ocean, the “Ring of Fire”. • The theory of plate tectonics helps explain this • CHALLENGE QUESTION: How does plate tectonics explain the locations of eart ...
... • The map on p D42 shows the locations of earthquakes and volcanoes on Earth. • Many of the most active volcanoes are on the edges of the Pacific Ocean, the “Ring of Fire”. • The theory of plate tectonics helps explain this • CHALLENGE QUESTION: How does plate tectonics explain the locations of eart ...
Changes in Earth`s Surface
... • Heat transported by convection • Core is ~5,000°C and surface is ~0°C • Where mantle rises: rifting • Where mantle sinks: subduction zones ...
... • Heat transported by convection • Core is ~5,000°C and surface is ~0°C • Where mantle rises: rifting • Where mantle sinks: subduction zones ...
Sample
... lithosphere, which is relatively strong and rigid compared with the soft asthenosphere found below it. The lithosphere is broken into large pieces called plates that move relative to one another. As these plates move, they carry along the continents embedded within them. This process of plate tecton ...
... lithosphere, which is relatively strong and rigid compared with the soft asthenosphere found below it. The lithosphere is broken into large pieces called plates that move relative to one another. As these plates move, they carry along the continents embedded within them. This process of plate tecton ...
... Mountain – a high large mass of rock &earth that rises above the Earth’s surface, with steep sloping sides 2. At divergent boundaries, tectonic plates are moving away from each other. One result of huge masses of crust moving apart is sea-floor spreading. This occurs when two plates made of oceanic ...
Chemistry Unit Test Study Guide
... 29. What is the difference between oceanic crust and continental crust? 30. What is the difference between the Earth’s crust and mantle? What are the similarities? 31. List the Earth’s layers from the center to the surface. 32. What is the difference between the inner core and the outer core? 33. Wh ...
... 29. What is the difference between oceanic crust and continental crust? 30. What is the difference between the Earth’s crust and mantle? What are the similarities? 31. List the Earth’s layers from the center to the surface. 32. What is the difference between the inner core and the outer core? 33. Wh ...
lesson-2-explore-page-115-shaping-earths-surface
... The seafloor between North America and Europe is made of ocean crust that formed after the continents began to spread apart. Mountains at Convergent Boundaries Mountains form when Earth’s crust folds and crumples. Tectonic plates are rigid pieces of lithosphere. The center of these rigid plates ...
... The seafloor between North America and Europe is made of ocean crust that formed after the continents began to spread apart. Mountains at Convergent Boundaries Mountains form when Earth’s crust folds and crumples. Tectonic plates are rigid pieces of lithosphere. The center of these rigid plates ...
Shifting Continents and Climates S
... the polar regions were free of ice. lead to climate changes. Oceans, creating the Isthmus of Panama. The continental shift led to changes in Since then, Earth’s history has been ocean circulation and Earth’s climate. marked by a sustained and nearly continRising mountains, closing gateways uous cool ...
... the polar regions were free of ice. lead to climate changes. Oceans, creating the Isthmus of Panama. The continental shift led to changes in Since then, Earth’s history has been ocean circulation and Earth’s climate. marked by a sustained and nearly continRising mountains, closing gateways uous cool ...
Plate Tectonics
... Earthquake activity is associated with all plate boundaries. Major features of convergent boundaries include collision zones (folded and thrustfaulted mountains) and subduction zones (volcanoes and trenches). Major features of divergent boundaries include mid-ocean ridges, rift valleys, and fissure ...
... Earthquake activity is associated with all plate boundaries. Major features of convergent boundaries include collision zones (folded and thrustfaulted mountains) and subduction zones (volcanoes and trenches). Major features of divergent boundaries include mid-ocean ridges, rift valleys, and fissure ...
Earthquake Notes
... Earthquake - Shaking and vibrating of the earth by large sudden releases of energy Fault - A fracture in the earthʼs crust where there has already been some movement Focus - Point of origin of earthquakes where waves travel outward in all directions Crust - Outermost layer of the earth Mantle - A la ...
... Earthquake - Shaking and vibrating of the earth by large sudden releases of energy Fault - A fracture in the earthʼs crust where there has already been some movement Focus - Point of origin of earthquakes where waves travel outward in all directions Crust - Outermost layer of the earth Mantle - A la ...
8th Grade Science Final - Union Beach School District
... 6. Where is the crust oldest? How does this support spreading centers? Boundary? Older crusts will be found away from the center, usually at trenches (convergent boundaries).Younger rock at a ridge (divergent boundaries) 7. Convection currents in the asthenosphere? As the hot molten rock moves in a ...
... 6. Where is the crust oldest? How does this support spreading centers? Boundary? Older crusts will be found away from the center, usually at trenches (convergent boundaries).Younger rock at a ridge (divergent boundaries) 7. Convection currents in the asthenosphere? As the hot molten rock moves in a ...
Plate Boundaries
... • A rift valley is a deep valley that forms along a divergent boundary on land • Rift valleys form as two slabs of Earth’s crust slide apart ...
... • A rift valley is a deep valley that forms along a divergent boundary on land • Rift valleys form as two slabs of Earth’s crust slide apart ...
Sea-Floor Spreading and Plate Tectonics
... the earth's surface. Because of this, thermal gradients develop in the earth's interior, causing hot, low-density material to rise toward the surface while cold, higher-density material sinks. The convective motion thus g~nerated in the earth's interior moves the lithospheric plates around on the su ...
... the earth's surface. Because of this, thermal gradients develop in the earth's interior, causing hot, low-density material to rise toward the surface while cold, higher-density material sinks. The convective motion thus g~nerated in the earth's interior moves the lithospheric plates around on the su ...
Cross section of the Earth
... layer of red-hot solid rocks; some of these rocks are so soft that they ooze about and can blast out of cracks in the crust, as lava. The layer under the mantle is called the Outer Core. It is made of liquid iron and nickel. Special movement in this section is responsible for the Earth’s magnetic ...
... layer of red-hot solid rocks; some of these rocks are so soft that they ooze about and can blast out of cracks in the crust, as lava. The layer under the mantle is called the Outer Core. It is made of liquid iron and nickel. Special movement in this section is responsible for the Earth’s magnetic ...
Study Guide - Earth and Space
... Convergent Plate Boundaries form where two plates collide. o Subduction is the process in which the denser plate sinks below the less dense plate. o A subduction zone is the area along a convergent boundary where a denser plate descends into Earth. o When an oceanic and continental plate collide, th ...
... Convergent Plate Boundaries form where two plates collide. o Subduction is the process in which the denser plate sinks below the less dense plate. o A subduction zone is the area along a convergent boundary where a denser plate descends into Earth. o When an oceanic and continental plate collide, th ...
Plate Tectonics
... is the Earth’s lithosphere made up of? Where can a volcano form? What plate are the Hawaiian Islands on? Are they at a plate boundary or a hot spot? What is a hot spot? Does a hot spot move? So what is moving? How many islands has this hot spot formed to make the Hawaiian Island chain? ...
... is the Earth’s lithosphere made up of? Where can a volcano form? What plate are the Hawaiian Islands on? Are they at a plate boundary or a hot spot? What is a hot spot? Does a hot spot move? So what is moving? How many islands has this hot spot formed to make the Hawaiian Island chain? ...
A1 Sample answer
... mountains’. Sedimentary rocks are the most common rock type as they are the most flexible Rock. Anticlines are formed when the rock is pushed upwards and synclines are formed when the rock is pushed downwards. The rock is pushed into a series of folds, simple folds then asymmetric folds into overfol ...
... mountains’. Sedimentary rocks are the most common rock type as they are the most flexible Rock. Anticlines are formed when the rock is pushed upwards and synclines are formed when the rock is pushed downwards. The rock is pushed into a series of folds, simple folds then asymmetric folds into overfol ...
The two major areas of the ocean floor are the and the
... 11. Wegener suggested that the continents were once ______________ and then ______________ apart to their current location. 12. Scientists working in the ________________ hemisphere had trouble catching on to his hypothesis. 13. The biggest problem scientists had with his hypothesis was the ________ ...
... 11. Wegener suggested that the continents were once ______________ and then ______________ apart to their current location. 12. Scientists working in the ________________ hemisphere had trouble catching on to his hypothesis. 13. The biggest problem scientists had with his hypothesis was the ________ ...
Evidence for Sea-Floor Spreading
... process of sea-floor spreading? • At the mid-ocean ridge, molten material rises from the mantle and erupts. The molten material then spreads out, pushing older rock to both sides of the ridge. • Over tens of millions of years, the process continues until the oldest ocean floor collides with the cont ...
... process of sea-floor spreading? • At the mid-ocean ridge, molten material rises from the mantle and erupts. The molten material then spreads out, pushing older rock to both sides of the ridge. • Over tens of millions of years, the process continues until the oldest ocean floor collides with the cont ...
22.4 Plate Tectonics
... There are about a dozen major tectonic plates. Most major plates contain both continental and oceanic crust. The edges of plates meet at plate boundaries. As the plates move apart, collide, or slide past each other, they cause changes in Earth’s surface. ...
... There are about a dozen major tectonic plates. Most major plates contain both continental and oceanic crust. The edges of plates meet at plate boundaries. As the plates move apart, collide, or slide past each other, they cause changes in Earth’s surface. ...
Bell Activity #15
... A. Uplifting of Depressed Rocks Uplift often happens when a weight is removed from the crust. B. Subsidence of Cooler Rocks Rocks that are hot take up more space than cooler rocks. The farther the lithosphere is from the ridge, the cooler and denser the lithosphere becomes. Because the oceanic litho ...
... A. Uplifting of Depressed Rocks Uplift often happens when a weight is removed from the crust. B. Subsidence of Cooler Rocks Rocks that are hot take up more space than cooler rocks. The farther the lithosphere is from the ridge, the cooler and denser the lithosphere becomes. Because the oceanic litho ...
Chapter405.ppt
... • This happens when the sea floor that lies between them is subducted, and the ocean becomes narrower and narrower until it is all gone and the continents, which as we’ve learned cannot subduct, collide with each other. • One continent may slide a short distance beneath another, but it will not go d ...
... • This happens when the sea floor that lies between them is subducted, and the ocean becomes narrower and narrower until it is all gone and the continents, which as we’ve learned cannot subduct, collide with each other. • One continent may slide a short distance beneath another, but it will not go d ...
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.