8.2: Continents change position over time
... Age of the sea floor: youngest rocks cloest to the ridge, oldest rocks farther away Oldest ocean floor is young – 160 to 180 my old; continental crust much older: 4 billion yrs ...
... Age of the sea floor: youngest rocks cloest to the ridge, oldest rocks farther away Oldest ocean floor is young – 160 to 180 my old; continental crust much older: 4 billion yrs ...
Chapter 10 * Plate Tectonics
... earthquakes in an area are evidence that there are two or more plates that meet in the area. The locations of volcanoes also indicates a tectonic plate boundary. The Pacific Ring of Fire is a zone of active volcanoes that surround the Pacific Ocean. ...
... earthquakes in an area are evidence that there are two or more plates that meet in the area. The locations of volcanoes also indicates a tectonic plate boundary. The Pacific Ring of Fire is a zone of active volcanoes that surround the Pacific Ocean. ...
Studyguide_PTtest
... ~ What are the 4 basic layers of the Earth? How would you describe each layer? ~ How are the lithosphere and asthenosphere related? ~ What did Wegener suggest with his continental drift hypothesis? ~ What evidence did he have to support his claims? ~ What was the hypothesis put forth by Harry Hess? ...
... ~ What are the 4 basic layers of the Earth? How would you describe each layer? ~ How are the lithosphere and asthenosphere related? ~ What did Wegener suggest with his continental drift hypothesis? ~ What evidence did he have to support his claims? ~ What was the hypothesis put forth by Harry Hess? ...
Plate Tectonics
... Describe (draw and write) how the movement of crustal plates can cause earthquakes and volcanic eruptions that can result in mountain building and trench formation. Click on the links to see what kind of picture you should draw. ...
... Describe (draw and write) how the movement of crustal plates can cause earthquakes and volcanic eruptions that can result in mountain building and trench formation. Click on the links to see what kind of picture you should draw. ...
Convection current
... • 1 oceanic + 1 continental collide= oceanic sinks beneath the continental plate (subduction) and forms a trench (a narrow, deep valley along the ocean floor). • Subduction- the process by which oceanic crust sinks beneath a less dense plate. ...
... • 1 oceanic + 1 continental collide= oceanic sinks beneath the continental plate (subduction) and forms a trench (a narrow, deep valley along the ocean floor). • Subduction- the process by which oceanic crust sinks beneath a less dense plate. ...
Lecture 1:
... 3. Tectonics - Study of the deformation of the Earth’s lithospheric plates 4. Plate Boundaries - line along with two adjacent plates are in contact - There are 3 types of boundaries: a) Divergent boundary (also called a Spreading Center) - Occurs when two plates are moving away from each other (e.g. ...
... 3. Tectonics - Study of the deformation of the Earth’s lithospheric plates 4. Plate Boundaries - line along with two adjacent plates are in contact - There are 3 types of boundaries: a) Divergent boundary (also called a Spreading Center) - Occurs when two plates are moving away from each other (e.g. ...
Plate_Tectonics_Day_1
... Geologists discovered the Earth has three layersthe crust, the mantle, and the core. The oceanic crust beneath the ocean consists mostly of dense rock. Continental crust also consists of dense rock. The crust makes up the lithosphere. The asthenosphere is a soft layer that can bend ...
... Geologists discovered the Earth has three layersthe crust, the mantle, and the core. The oceanic crust beneath the ocean consists mostly of dense rock. Continental crust also consists of dense rock. The crust makes up the lithosphere. The asthenosphere is a soft layer that can bend ...
Continental_Drift_and_Plate_Boundaries_
... plates which float on semi-molten rock • Convection currents in the mantle push the plates around on the surface of the Earth • Because of plate movements the surface of the Earth is constantly changing •Plate boundaries are where Earthquakes, volcanoes and mountain ranges occur • Crust is made at m ...
... plates which float on semi-molten rock • Convection currents in the mantle push the plates around on the surface of the Earth • Because of plate movements the surface of the Earth is constantly changing •Plate boundaries are where Earthquakes, volcanoes and mountain ranges occur • Crust is made at m ...
NOTES Plate Tectonics
... 10. If new ocean floor is added all the time at mid-ocean ridges, why is the Earth not getting larger? Old ocean floor is subducted at continental margins. 11. Subduction - the process that occurs when ocean floor sinks beneath a deep ocean trench and returns to the mantle. ...
... 10. If new ocean floor is added all the time at mid-ocean ridges, why is the Earth not getting larger? Old ocean floor is subducted at continental margins. 11. Subduction - the process that occurs when ocean floor sinks beneath a deep ocean trench and returns to the mantle. ...
PT Notes Fill in
... a. The pattern on one side of a ridge is a ________________________ of the other side b. Reversal patterns __________________________________________ rock D. Wegener Redeemed! 1. _____________________________ was the missing mechanism that _____________ needed to prove his theory E. Effects of _____ ...
... a. The pattern on one side of a ridge is a ________________________ of the other side b. Reversal patterns __________________________________________ rock D. Wegener Redeemed! 1. _____________________________ was the missing mechanism that _____________ needed to prove his theory E. Effects of _____ ...
The Theory of Continental Drift (Now Plate Tectonics)
... plates about ____km’s thick - These plates ________ on the earth’s semi-molten asthenosphere (the top layer of the earth’s mantle) and are driven by convection (______) cycles in the mantle. - __________ plates move about 10 cm/year - _________________ plates about 2 cm/year - It is believed that th ...
... plates about ____km’s thick - These plates ________ on the earth’s semi-molten asthenosphere (the top layer of the earth’s mantle) and are driven by convection (______) cycles in the mantle. - __________ plates move about 10 cm/year - _________________ plates about 2 cm/year - It is believed that th ...
Earth`s Changing Surface Review
... changes in the fluid’s density, and the force of gravity combine to set convection currents in motion. As the convection currents move, they move the crust above them. ...
... changes in the fluid’s density, and the force of gravity combine to set convection currents in motion. As the convection currents move, they move the crust above them. ...
File - Flipped Out Science with Mrs. Thomas!
... changes in the fluid’s density, and the force of gravity combine to set convection currents in motion. As the convection currents move, they move the crust above them. ...
... changes in the fluid’s density, and the force of gravity combine to set convection currents in motion. As the convection currents move, they move the crust above them. ...
study-guide-test-on-plate
... In continental drift the continents have moved very slowly to their current positions Matching rock structures on different continents help prove the theory of continental drift Convection currents inside earth drive plate motion Density differences cause liquid rock to rise up through the asthenosp ...
... In continental drift the continents have moved very slowly to their current positions Matching rock structures on different continents help prove the theory of continental drift Convection currents inside earth drive plate motion Density differences cause liquid rock to rise up through the asthenosp ...
Science 8
... b. Pangaea c. Wegener ____9. What mountains were formed by the collision of the Indo-Australian Plate and the Eurasian Plate? a. Appalachian b. Rocky c. Himalayan ____10. The matching of ________ on different continents are evidence of continental drift. a. Weather patterns b. Wind systems c. Rock s ...
... b. Pangaea c. Wegener ____9. What mountains were formed by the collision of the Indo-Australian Plate and the Eurasian Plate? a. Appalachian b. Rocky c. Himalayan ____10. The matching of ________ on different continents are evidence of continental drift. a. Weather patterns b. Wind systems c. Rock s ...
Science 8
... b. Pangaea c. Wegener ____9. What mountains were formed by the collision of the Indo-Australian Plate and the Eurasian Plate? a. Appalachian b. Rocky c. Himalayan ____10. The matching of ________ on different continents are evidence of continental drift. a. Weather patterns b. Wind systems c. Rock s ...
... b. Pangaea c. Wegener ____9. What mountains were formed by the collision of the Indo-Australian Plate and the Eurasian Plate? a. Appalachian b. Rocky c. Himalayan ____10. The matching of ________ on different continents are evidence of continental drift. a. Weather patterns b. Wind systems c. Rock s ...
Plate Tectonics Tectonics
... • Inability to provide a mechanism capable of moving continents across globe • Wegner suggested that continents broke through the ocean crust, much like ice breakers cut through ice ...
... • Inability to provide a mechanism capable of moving continents across globe • Wegner suggested that continents broke through the ocean crust, much like ice breakers cut through ice ...
Earth`s Magnetic Field
... __________ 2. Most geologists believe that continents are larger now than they were in the past. __________ 3. The size of the earth is gradually increasing over time because of seafloor spreading. __________ 4. Tectonic plates drift in oceans of melted magma just below the surface of the earth. ___ ...
... __________ 2. Most geologists believe that continents are larger now than they were in the past. __________ 3. The size of the earth is gradually increasing over time because of seafloor spreading. __________ 4. Tectonic plates drift in oceans of melted magma just below the surface of the earth. ___ ...
IntrotoPlateTectonicTheory
... they reached the positions they currently occupy. These continents are still on the move today. ...
... they reached the positions they currently occupy. These continents are still on the move today. ...
Lesson 6 - Earth Formation
... The crust constantly changes due to erosion, deposition, glacial action and plate tectonics. There are two types of crust. Continental - Granite-like rock rich in silicon, oxygen and aluminum. Oceanic - Igneous, basaltic rock containing greater amounts of heavier elements such as magnesium and i ...
... The crust constantly changes due to erosion, deposition, glacial action and plate tectonics. There are two types of crust. Continental - Granite-like rock rich in silicon, oxygen and aluminum. Oceanic - Igneous, basaltic rock containing greater amounts of heavier elements such as magnesium and i ...
"Plate Tectonics" Extra Credit Assignment
... 2. The inner core is made mostly of ____________ and is found __________ miles to _____________miles below the surface and is about ____________ in diameter. 3. What is the Earth’s only liquid layer? ____________________________ 4. Is the crust the thickest under the ocean or under the continents? _ ...
... 2. The inner core is made mostly of ____________ and is found __________ miles to _____________miles below the surface and is about ____________ in diameter. 3. What is the Earth’s only liquid layer? ____________________________ 4. Is the crust the thickest under the ocean or under the continents? _ ...
Words to know
... asthenosphere is about 180 km thick. Basalt— a hard, black volcanic rock with less than about 52 weight percent silica (SiO2) and high amounts of heavy elements like iron and magnesium and low sodium and potassium (see Rhyolite below). This magma has a high temperature and low viscosity and tend to ...
... asthenosphere is about 180 km thick. Basalt— a hard, black volcanic rock with less than about 52 weight percent silica (SiO2) and high amounts of heavy elements like iron and magnesium and low sodium and potassium (see Rhyolite below). This magma has a high temperature and low viscosity and tend to ...
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.