Unit 4
... fundamental question raised by his critics: what kind of forces could be strong enough to move such large masses of solid rock over such great distances? E After Wegener`s death in 1930, new evidence from ocean floor exploration and other studies rekindled interest in his theory, ultimately leading, ...
... fundamental question raised by his critics: what kind of forces could be strong enough to move such large masses of solid rock over such great distances? E After Wegener`s death in 1930, new evidence from ocean floor exploration and other studies rekindled interest in his theory, ultimately leading, ...
The Dynamic Crust
... Orogeny refers to times of mountain building A transform boundary occurs when two plates slide past one another. This dragging builds up potential energy which is eventually released as kinetic energy as earthquakes ...
... Orogeny refers to times of mountain building A transform boundary occurs when two plates slide past one another. This dragging builds up potential energy which is eventually released as kinetic energy as earthquakes ...
formation of Plate tectonic theory
... Large-scale convection cells in the mantle create new ocean floor at the ridges, where the rising limbs diverge and move to either side until they cool and plunge down into the mantle at the trenches (just like 1st year text books). ...
... Large-scale convection cells in the mantle create new ocean floor at the ridges, where the rising limbs diverge and move to either side until they cool and plunge down into the mantle at the trenches (just like 1st year text books). ...
Sea-Floor Spreading - Catawba County Schools
... and then records the echoes of these sound waves. Sonar mapped midocean ridges. ...
... and then records the echoes of these sound waves. Sonar mapped midocean ridges. ...
Seafloor Spreading - Madison Public Schools
... Places where plates slide past each other are called transform boundaries. Since the plates on either side of a transform boundary are merely sliding past each other and not tearing or crunching each other, transform boundaries lack the spectacular features found at convergent and divergent boundari ...
... Places where plates slide past each other are called transform boundaries. Since the plates on either side of a transform boundary are merely sliding past each other and not tearing or crunching each other, transform boundaries lack the spectacular features found at convergent and divergent boundari ...
Internal Forces that Shape the Earth (Plate Actions)
... Sediment moves into the ocean and sinks, or it may accumulate and build a delta. ...
... Sediment moves into the ocean and sinks, or it may accumulate and build a delta. ...
Name - WAHS
... Lithosphere – the outermost layer of the Earth, consisting of the Earth’s crust and part of the upper mantle. The lithosphere is a rigid layer. Crust – the thin outermost layer of the Earth. There are two types: continental and oceanic crust. Mantle – the zone of the Earth below the crust and above ...
... Lithosphere – the outermost layer of the Earth, consisting of the Earth’s crust and part of the upper mantle. The lithosphere is a rigid layer. Crust – the thin outermost layer of the Earth. There are two types: continental and oceanic crust. Mantle – the zone of the Earth below the crust and above ...
• Observations related to plate tectonics • Plate tectonic theory
... good questions for a quiz. ...
... good questions for a quiz. ...
Causes of Plate Tectonics
... The land mass broke apart about _______________________ years ago and The _______________________ slowly drifted to their present positions ...
... The land mass broke apart about _______________________ years ago and The _______________________ slowly drifted to their present positions ...
Geologic Hazards
... • Plate Tectonics Theory – Describes lithosphere as being broken into plates that are in motion – Explains origin and locations of such things as volcanoes, fault zones and mountain belts ...
... • Plate Tectonics Theory – Describes lithosphere as being broken into plates that are in motion – Explains origin and locations of such things as volcanoes, fault zones and mountain belts ...
ROCKING AND ROLLING By Philip Steele DOWN UNDER Our
... big pieces. The pieces are called plates, and there are about 20 of them. They float on the lower part of the earth’s mantle, moving very, very slowly – between 1 and 8 inches per year. Sometimes the plates move apart and gooey magma rises up from the mantle to fill the gap. The magma cools and hard ...
... big pieces. The pieces are called plates, and there are about 20 of them. They float on the lower part of the earth’s mantle, moving very, very slowly – between 1 and 8 inches per year. Sometimes the plates move apart and gooey magma rises up from the mantle to fill the gap. The magma cools and hard ...
Week 2 (Norton), part a (pdf, 2.2 MB)
... continents and depress underlying landforms, and continental edges in areas of compression (due to global cooling and shrinking) where upthrust rock depresses underlying layers. ...
... continents and depress underlying landforms, and continental edges in areas of compression (due to global cooling and shrinking) where upthrust rock depresses underlying layers. ...
Lesson 1 - Humanities.Com
... Oceanic plate goes beneath continental plate because it is denser (heavier). ...
... Oceanic plate goes beneath continental plate because it is denser (heavier). ...
Examples posted for the midterm test.
... They involve compression and relaxation of rocks through which they pass. They travel through solids and liquids. a), c) and d). ...
... They involve compression and relaxation of rocks through which they pass. They travel through solids and liquids. a), c) and d). ...
File
... Convection currents in action! At left, two animal cookies represent two of the Earth's tectonic plates. At right, the two plates have moved apart, much like what happens at a divergent margin. The chocolate pudding represents the Earth's mantle. The heat source beneath the pot created convection c ...
... Convection currents in action! At left, two animal cookies represent two of the Earth's tectonic plates. At right, the two plates have moved apart, much like what happens at a divergent margin. The chocolate pudding represents the Earth's mantle. The heat source beneath the pot created convection c ...
tectonics2a
... ridge grow as new crustal material is added at the spreading center. Rifts are characterized by relatively shallow earthquake foci along the length of the rift. ...
... ridge grow as new crustal material is added at the spreading center. Rifts are characterized by relatively shallow earthquake foci along the length of the rift. ...
The continental jigsaw puzzle
... moved. (A widely accepted explanation before the swum across an ocean; rocks of the same type 1960s was that the continents had not moved, but and age that match; fold belts which seem to stop they were formerly linked by lost continental at the coast, only to appear again on the other masses or by ...
... moved. (A widely accepted explanation before the swum across an ocean; rocks of the same type 1960s was that the continents had not moved, but and age that match; fold belts which seem to stop they were formerly linked by lost continental at the coast, only to appear again on the other masses or by ...
11.11 The Earth`s tectonic plates (2 pages)
... The Earth’s crust includes ocean floors, islands, and continents with plains, high mountains and deep valleys. In some places, earthquakes shake the ground and volcanos spew out ash, smoke and red hot larva. In the rest of this chapter, we will consider how these things come to be. The Earth’s crust ...
... The Earth’s crust includes ocean floors, islands, and continents with plains, high mountains and deep valleys. In some places, earthquakes shake the ground and volcanos spew out ash, smoke and red hot larva. In the rest of this chapter, we will consider how these things come to be. The Earth’s crust ...
Ch 9 - Mr. Neason`s Earth Science
... 1. The plates are on the top part of mantle convection currents 2. The weakness of the asthenosphere allows the stiff lithosphere above to slide across it. 3. At the “top” of these convection currents, ocean plates cool and become denser than the mantle rock beneath them. 4. As a result, an ocean pl ...
... 1. The plates are on the top part of mantle convection currents 2. The weakness of the asthenosphere allows the stiff lithosphere above to slide across it. 3. At the “top” of these convection currents, ocean plates cool and become denser than the mantle rock beneath them. 4. As a result, an ocean pl ...
CEE 437 Lecture 1
... Engineering and Geology • William Smith and the English geological map • Karl Terzaghi and insights to the distribution of earth materials • Earth heterogeneity!!!! ...
... Engineering and Geology • William Smith and the English geological map • Karl Terzaghi and insights to the distribution of earth materials • Earth heterogeneity!!!! ...
UNIT 1, Chapter 1, Lesson 2
... __________________________, and _____________________ in its compounds. It more closely resembles mantle material than crust material since it is created mainly through volcanic flows of lava from the mantle. 4. Continental crust is thickest where there are mountains. Here it can be as much as _____ ...
... __________________________, and _____________________ in its compounds. It more closely resembles mantle material than crust material since it is created mainly through volcanic flows of lava from the mantle. 4. Continental crust is thickest where there are mountains. Here it can be as much as _____ ...
Plate Tectonics
... produce a “rift” – a giant crack • If a rift tears apart a continent and widens for millions of years, a new sea forms (and can gradually form a new ocean) ...
... produce a “rift” – a giant crack • If a rift tears apart a continent and widens for millions of years, a new sea forms (and can gradually form a new ocean) ...
Sea Floor Spreading LAB 2017
... continually been forming over millions of years at the mid-ocean ridges. Hess found that on each side of the ridge, sea floor got older as a person moved away from the ridge towards the continents. The older, denser oceanic crust eventually descends into deep trenches along the continents and is rec ...
... continually been forming over millions of years at the mid-ocean ridges. Hess found that on each side of the ridge, sea floor got older as a person moved away from the ridge towards the continents. The older, denser oceanic crust eventually descends into deep trenches along the continents and is rec ...
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.