Composition of Earth – Encarta
... are present in the lithosphere almost entirely in the form of compounds rather than in their free state. The lithosphere comprises two shells—the crust and upper mantle—that are divided into a dozen or so rigid tectonic plates. These are constantly in movement, driven by the flow of heat from the in ...
... are present in the lithosphere almost entirely in the form of compounds rather than in their free state. The lithosphere comprises two shells—the crust and upper mantle—that are divided into a dozen or so rigid tectonic plates. These are constantly in movement, driven by the flow of heat from the in ...
Lesson 2 plates
... When continental plates meet continental plates neither can subduct the other because they both have the same density. The plates are being forced together at great pressure so the rocks crumble together and form massive mountain chains like the Himalayas. The Himalayas are still growing today as th ...
... When continental plates meet continental plates neither can subduct the other because they both have the same density. The plates are being forced together at great pressure so the rocks crumble together and form massive mountain chains like the Himalayas. The Himalayas are still growing today as th ...
Plate tectonics powerpoint presentation File
... When continental plates meet continental plates neither can subduct the other because they both have the same density. The plates are being forced together at great pressure so the rocks crumble together and form massive mountain chains like the Himalayas. The Himalayas are still growing today as th ...
... When continental plates meet continental plates neither can subduct the other because they both have the same density. The plates are being forced together at great pressure so the rocks crumble together and form massive mountain chains like the Himalayas. The Himalayas are still growing today as th ...
Plate Tectonics
... When continental plates meet continental plates neither can subduct the other because they both have the same density. The plates are being forced together at great pressure so the rocks crumble together and form massive mountain chains like the Himalayas. The Himalayas are still growing today as th ...
... When continental plates meet continental plates neither can subduct the other because they both have the same density. The plates are being forced together at great pressure so the rocks crumble together and form massive mountain chains like the Himalayas. The Himalayas are still growing today as th ...
Tectonic Map of the World
... When continental plates meet continental plates neither can subduct the other because they both have the same density. The plates are being forced together at great pressure so the rocks crumble together and form massive mountain chains like the Himalayas. The Himalayas are still growing today as th ...
... When continental plates meet continental plates neither can subduct the other because they both have the same density. The plates are being forced together at great pressure so the rocks crumble together and form massive mountain chains like the Himalayas. The Himalayas are still growing today as th ...
Plate Tectonics
... mapping the ocean floor with a fathometer - a type of sonar that used echo sounding to help ships know where the bottom of the ocean floor was. He proposed that hot, less dense material below the crust rises toward the surface at the mid ocean ridges, flowing sideways, carrying the seafloor away fro ...
... mapping the ocean floor with a fathometer - a type of sonar that used echo sounding to help ships know where the bottom of the ocean floor was. He proposed that hot, less dense material below the crust rises toward the surface at the mid ocean ridges, flowing sideways, carrying the seafloor away fro ...
Know the pulling force that acts on tectonic plates, causing the
... Know the pulling force that acts on tectonic plates, causing the lithosphere to become thinner. Tension Be able to describe a divergent boundary and a convergent boundary. ...
... Know the pulling force that acts on tectonic plates, causing the lithosphere to become thinner. Tension Be able to describe a divergent boundary and a convergent boundary. ...
Chapter 7 Plate Tectonics
... opposing forces cause rock to break and move horizontally. strike-slip 16. The type of fault that often results when rocks are pulled apart due to tension is called a _____. normal fault ...
... opposing forces cause rock to break and move horizontally. strike-slip 16. The type of fault that often results when rocks are pulled apart due to tension is called a _____. normal fault ...
Physical Science - elyceum-beta
... What is the best explanation for the matched bands of rock? • New ocean floor is being produced from the ridge • Older material material is pushed away from ridge by newer material • This in turn moves the continents apart ...
... What is the best explanation for the matched bands of rock? • New ocean floor is being produced from the ridge • Older material material is pushed away from ridge by newer material • This in turn moves the continents apart ...
Bill_Nye_Earth crust Main
... 6. Volcanoes give us a ___________________________ to what’s underneath the Earth’s crust. 7. Scientists believe that Earth’s crust is made of tectonic _____________________________. 8. The plates are floating on the Earth’s ( crust, mantle, ...
... 6. Volcanoes give us a ___________________________ to what’s underneath the Earth’s crust. 7. Scientists believe that Earth’s crust is made of tectonic _____________________________. 8. The plates are floating on the Earth’s ( crust, mantle, ...
Bill Nye The Science Guy
... 6. Volcanoes give us a ___________________________ to what’s underneath the Earth’s crust. 7. Scientists believe that Earth’s crust is made of tectonic _____________________________. 8. The plates are floating on the Earth’s ( crust, mantle, ...
... 6. Volcanoes give us a ___________________________ to what’s underneath the Earth’s crust. 7. Scientists believe that Earth’s crust is made of tectonic _____________________________. 8. The plates are floating on the Earth’s ( crust, mantle, ...
8_Plate_Tectonics_n_Layers_of_the_Earth
... oceanic crust and continental crust? 1. The continental crust is composed of granite while the oceanic crust is composed of basalt. 2. The density of the continental crust is less than the oceanic crust, thus it floats higher on the mantle. ...
... oceanic crust and continental crust? 1. The continental crust is composed of granite while the oceanic crust is composed of basalt. 2. The density of the continental crust is less than the oceanic crust, thus it floats higher on the mantle. ...
Chapter 3: Earth Structure and Plate Tectonics
... aesthenosphere, they interact among each other. The result of these interactions is the existence of 3 types of boundaries: Divergent: plates move away from each other, examples: * Divergent oceanic crust: the Mid-Atlantic Ridge * Divergent continental crust: the Rift Valley of East Africa (b) Conve ...
... aesthenosphere, they interact among each other. The result of these interactions is the existence of 3 types of boundaries: Divergent: plates move away from each other, examples: * Divergent oceanic crust: the Mid-Atlantic Ridge * Divergent continental crust: the Rift Valley of East Africa (b) Conve ...
Plate Tectonics - Cloudfront.net
... How? • The plates are pulled apart by convection currents in the mantle below • Caused by heat released from natural radioactive processes • At mid-ocean ridges molten rock from below rises up to fill the gap with new basaltic rock ...
... How? • The plates are pulled apart by convection currents in the mantle below • Caused by heat released from natural radioactive processes • At mid-ocean ridges molten rock from below rises up to fill the gap with new basaltic rock ...
Key elements of Plate Tectonics
... Subduction may occur along the East coast of North America All of the Earth’s landmasses may reunite into another Pangaea-like supercontinent ...
... Subduction may occur along the East coast of North America All of the Earth’s landmasses may reunite into another Pangaea-like supercontinent ...
File - Sturgeon City
... molten layer of upper mantel. Major geologic events such as volcanic eruptions result from these plates. The place where two plates meet is called a boundary. The two types of plates are continental and oceanic. Continental plates are thicker but less dense than oceanic plates. This means when the t ...
... molten layer of upper mantel. Major geologic events such as volcanic eruptions result from these plates. The place where two plates meet is called a boundary. The two types of plates are continental and oceanic. Continental plates are thicker but less dense than oceanic plates. This means when the t ...
Birth of the Himalaya
... To understand the fascinating mechanics of the collision of India with Asia we must first look beneath the Earth's surface. The continents are carried by the Earth's tectonic plates like people on an escalator. There are currently 7 giant plates sliding across the Earth's surface, and a handful of s ...
... To understand the fascinating mechanics of the collision of India with Asia we must first look beneath the Earth's surface. The continents are carried by the Earth's tectonic plates like people on an escalator. There are currently 7 giant plates sliding across the Earth's surface, and a handful of s ...
the earth`s interior
... Ever since its formation—some 4.5 billion years ago—the earth has been losing heat. The deeper one goes inside the earth, the greater the temperature becomes. The pressure rises, too. The earth’s outer layer, or crust, is the coolest and least dense of all the layers inside the earth. (You might com ...
... Ever since its formation—some 4.5 billion years ago—the earth has been losing heat. The deeper one goes inside the earth, the greater the temperature becomes. The pressure rises, too. The earth’s outer layer, or crust, is the coolest and least dense of all the layers inside the earth. (You might com ...
Plate Tectonics fill
... 2. Source of heat: a. Heat left over from Earth’s formation b. The decay of radioactive isotopes. 3. But, rock isn’t a fluid so how can if convect? a. Solid rock will creep when subjected to enough heat an pressure. b. At 1,835o F it behaves like Silly Putty™. It behaves plastically like a fluid. 4. ...
... 2. Source of heat: a. Heat left over from Earth’s formation b. The decay of radioactive isotopes. 3. But, rock isn’t a fluid so how can if convect? a. Solid rock will creep when subjected to enough heat an pressure. b. At 1,835o F it behaves like Silly Putty™. It behaves plastically like a fluid. 4. ...
Changes in the Earth and its Atmosphere
... Write a short paragraph to explain why Wegener’s theory of continental drift was not generally accepted for many years: ...
... Write a short paragraph to explain why Wegener’s theory of continental drift was not generally accepted for many years: ...
Time - Research School of Earth Sciences
... How are relative ages of rocks classified? Fossils (remnants of prehistoric life ...
... How are relative ages of rocks classified? Fossils (remnants of prehistoric life ...
Plate Tectonics
... reaches the surface, it cools and becomes less dense, so it sinks. This rising and sinking creates a circular motion within the fluid. 3. convergent plate boundaries- where two tectonic plates move toward each other 4. divergent plate boundaries- where two tectonic plates move away from each other 5 ...
... reaches the surface, it cools and becomes less dense, so it sinks. This rising and sinking creates a circular motion within the fluid. 3. convergent plate boundaries- where two tectonic plates move toward each other 4. divergent plate boundaries- where two tectonic plates move away from each other 5 ...
The sea floor spreads apart at divergent boundaries.
... Mid-ocean ridges are the longest chain of mountains on Earth. Most of these ridges contain a rift valley along their center, as shown in the diagram below. When molten material rises from the asthenosphere, cold ocean water cools the rock until it becomes solid. As the plates move apart, new cracks ...
... Mid-ocean ridges are the longest chain of mountains on Earth. Most of these ridges contain a rift valley along their center, as shown in the diagram below. When molten material rises from the asthenosphere, cold ocean water cools the rock until it becomes solid. As the plates move apart, new cracks ...
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.