Earth`s Structure Learning Targets
... under the continental crust. I can explain how convection currents in the asthenosphere cause the tectonic plate movement. The thermal energy in the core heats up the lower part of the “plastic” molten asthenosphere. Warm currents rise to the top of the asthenosphere. When it begins to cool, it sta ...
... under the continental crust. I can explain how convection currents in the asthenosphere cause the tectonic plate movement. The thermal energy in the core heats up the lower part of the “plastic” molten asthenosphere. Warm currents rise to the top of the asthenosphere. When it begins to cool, it sta ...
Tectonics 1 - Montville.net
... youngest • Age increased away from ridge • Age of rocks with same magnetism is same • Therefore must have been formed at mid ocean ridge and been forced away by formation of new crust ...
... youngest • Age increased away from ridge • Age of rocks with same magnetism is same • Therefore must have been formed at mid ocean ridge and been forced away by formation of new crust ...
Plate Movement Types
... plate activity occurs at the Mid-Atlantic ridge, where Eurasian and North American, and South American and African plates separate. ...
... plate activity occurs at the Mid-Atlantic ridge, where Eurasian and North American, and South American and African plates separate. ...
Getting to Know: Evidence for Plate Tectonics
... What evidence supports the theory of plate tectonics? There is a great deal of scientific evidence in support of plate tectonics. For example, the movement of the continents over time has left a great deal of physical evidence. Coastlines on opposite continents appear to fit together like puzzle pie ...
... What evidence supports the theory of plate tectonics? There is a great deal of scientific evidence in support of plate tectonics. For example, the movement of the continents over time has left a great deal of physical evidence. Coastlines on opposite continents appear to fit together like puzzle pie ...
Theory of Plate Tectonics
... – Subduction occurs when one of the two converging plates descends beneath the other. – A subduction zone forms when one oceanic plate, which has become denser as a result of cooling, descends below another plate creating a deepsea trench. – The subducted plate descends into the mantle and melts. – ...
... – Subduction occurs when one of the two converging plates descends beneath the other. – A subduction zone forms when one oceanic plate, which has become denser as a result of cooling, descends below another plate creating a deepsea trench. – The subducted plate descends into the mantle and melts. – ...
Story of the Red Centre
... Mid-ocean ridges are gaps between tectonic plates that mantle the Earth like seams on a cricket ball. Hot magma wells up at the ridges, forming new ocean crust and shoving the plates apart. At subduction zones, two tectonic plates meet and one slides beneath the other back into the mantle, the laye ...
... Mid-ocean ridges are gaps between tectonic plates that mantle the Earth like seams on a cricket ball. Hot magma wells up at the ridges, forming new ocean crust and shoving the plates apart. At subduction zones, two tectonic plates meet and one slides beneath the other back into the mantle, the laye ...
Document
... the mantle • Asthenosphere: the solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly and allows tectonic plates to move on top of it • Play movie at 3:57 ...
... the mantle • Asthenosphere: the solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly and allows tectonic plates to move on top of it • Play movie at 3:57 ...
Earth`s Interior
... – Strike-Slip Faults: rock on either side of the fault slip past each other sideways. – Normal Faults: fault is at an angle Hanging wall: half of the fault above Footwall: half of the fault below ...
... – Strike-Slip Faults: rock on either side of the fault slip past each other sideways. – Normal Faults: fault is at an angle Hanging wall: half of the fault above Footwall: half of the fault below ...
Types of plate boundaries
... • These are younger trenches than at O-O subduction • Earthquakes also happen here ...
... • These are younger trenches than at O-O subduction • Earthquakes also happen here ...
Plate Tectonics
... Radiation- The transfer of heat energy through space. No direct contact with anything. Example: Sun and fire. Conduction- The transfer of heat between objects that are touching. Examples: a spoon in a hot cup of tea. Your hand touching the hot handle of a pot on a stove. Convection- The movement of ...
... Radiation- The transfer of heat energy through space. No direct contact with anything. Example: Sun and fire. Conduction- The transfer of heat between objects that are touching. Examples: a spoon in a hot cup of tea. Your hand touching the hot handle of a pot on a stove. Convection- The movement of ...
Plate Tectonics - Department of Physics and Astronomy
... – Large-scale surface features – Related phenomena ...
... – Large-scale surface features – Related phenomena ...
Marine Biology Exam 1 Study Guide
... Waves: crest, trough, wave height, wave length Photosynthesis & Cellular Respiration Chemosynthesis Cells Various organelles Water regulation; osmosis Possible Essay Questions: 1. Explain the steps of the scientific method including the definitions of a hypothesis and a scientific theory. 2. Explain ...
... Waves: crest, trough, wave height, wave length Photosynthesis & Cellular Respiration Chemosynthesis Cells Various organelles Water regulation; osmosis Possible Essay Questions: 1. Explain the steps of the scientific method including the definitions of a hypothesis and a scientific theory. 2. Explain ...
Plate Tectonics and Sea Floor Spreading
... plates that are mostly under the oceans. Plate tectonics show us powerful forces at work within the earth. These forces cause earthquakes to happen, volcanoes to erupt, and mountains to form. People cannot control these powerful forces, but we can learn a lot from them. ...
... plates that are mostly under the oceans. Plate tectonics show us powerful forces at work within the earth. These forces cause earthquakes to happen, volcanoes to erupt, and mountains to form. People cannot control these powerful forces, but we can learn a lot from them. ...
Convergent Boundaries
... oceanic crust sinks because it is colder and denser than the continental crust. At these sites, deep-ocean trenches also form, along with coastal mountains. ...
... oceanic crust sinks because it is colder and denser than the continental crust. At these sites, deep-ocean trenches also form, along with coastal mountains. ...
Quiz Maker - Geneva 304
... In 1947, more evidence to support the theory came from the study of the Mid-Atlantic Ridge on the ocean floor. This volcanic rock was found to be much younger than continental rock. Harry Hess reasoned that new volcanic mountains were being formed as the sea floor was moving away from each side of t ...
... In 1947, more evidence to support the theory came from the study of the Mid-Atlantic Ridge on the ocean floor. This volcanic rock was found to be much younger than continental rock. Harry Hess reasoned that new volcanic mountains were being formed as the sea floor was moving away from each side of t ...
How can you model Earth movements?
... The Earth’s surface is made up of large _________________ of rock. These float across the liquid _________________like rafts. Large scale movements of the Earth’s crust can cause ______________ ranges to form very slowly over millions of years. These replace older mountain ranges worn down by ______ ...
... The Earth’s surface is made up of large _________________ of rock. These float across the liquid _________________like rafts. Large scale movements of the Earth’s crust can cause ______________ ranges to form very slowly over millions of years. These replace older mountain ranges worn down by ______ ...
Unit VI: Solid Earth Circulation
... 4.) Why are earthquakes focused along plate margins? Earthquakes are the result of plate motion: The plates move relative to each other at average speeds of a few centimeters per year. As a result of friction between the plates, there are alternating periods of stasis (during which stresses build) a ...
... 4.) Why are earthquakes focused along plate margins? Earthquakes are the result of plate motion: The plates move relative to each other at average speeds of a few centimeters per year. As a result of friction between the plates, there are alternating periods of stasis (during which stresses build) a ...
Introduction to Plate Tectonics
... • new oceanic crust continuously spread away from the ridges in a conveyor belt-like motion – Crust is destroyed at the trenches • After millions of years, oceanic crust descends into very deep, narrow canyons along the rim of the Pacific Ocean basin. – the Atlantic Ocean was expanding while the Pac ...
... • new oceanic crust continuously spread away from the ridges in a conveyor belt-like motion – Crust is destroyed at the trenches • After millions of years, oceanic crust descends into very deep, narrow canyons along the rim of the Pacific Ocean basin. – the Atlantic Ocean was expanding while the Pac ...
Plate Boundary
... • Deep sea drilling supports the hypothesis that ocean crust is forming at the ridges and moving away from the ridges. ...
... • Deep sea drilling supports the hypothesis that ocean crust is forming at the ridges and moving away from the ridges. ...
Earth`s Internal Properties
... Divergent Plate Boundaries • plates are being pulled apart • sea floor spreading at Mid-Atlantic Ridge • Eurasia and North America are separating at a rate of about 5 cm per year • East African Rift Valley ...
... Divergent Plate Boundaries • plates are being pulled apart • sea floor spreading at Mid-Atlantic Ridge • Eurasia and North America are separating at a rate of about 5 cm per year • East African Rift Valley ...
Earth Geology/Tectonics
... Motion of plates is driven primarily by convection in the mantle. Hot molten earth goo rises, cools, and sinks. This creates motion in the material on which the plates float. ...
... Motion of plates is driven primarily by convection in the mantle. Hot molten earth goo rises, cools, and sinks. This creates motion in the material on which the plates float. ...
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.