Plate boundary Tour
... As you have learned, where there is upwelling of the asthenosphere, the crust above spreads apart, and new material from below bulges up into ridges. Where there is subsidence of the asthenosphere, the crust is being pulled down along with it to form depressions, or trenches. This can be visualized ...
... As you have learned, where there is upwelling of the asthenosphere, the crust above spreads apart, and new material from below bulges up into ridges. Where there is subsidence of the asthenosphere, the crust is being pulled down along with it to form depressions, or trenches. This can be visualized ...
Plate Tectonics
... Earths crust is not a uniform covering, its made of 8 major and minor plates – North American/Pacific/Juan de Fuca plate As these plates move, the continents are rafted along passively (like a piggyback ride on top of Aesthenosphere, which is on top of the mantle 1960’s the Theory of Continental Dri ...
... Earths crust is not a uniform covering, its made of 8 major and minor plates – North American/Pacific/Juan de Fuca plate As these plates move, the continents are rafted along passively (like a piggyback ride on top of Aesthenosphere, which is on top of the mantle 1960’s the Theory of Continental Dri ...
here - Crescent School
... similar fit appears across the Pacific. The fit is even more striking when the submerged continental shelves are compared rather than the coastlines. ...
... similar fit appears across the Pacific. The fit is even more striking when the submerged continental shelves are compared rather than the coastlines. ...
plates test from TASA.cwk
... ( ) Continental plates move in the opposite direction of oceanic plates ( ) Plates move as units ( ) Continental plates move faster than oceanic plates ( ) The distance between cities on different plates is always changing ...
... ( ) Continental plates move in the opposite direction of oceanic plates ( ) Plates move as units ( ) Continental plates move faster than oceanic plates ( ) The distance between cities on different plates is always changing ...
Where the African plate and the South American plate meet is:
... How do plates move where convection currents are rising: (a) together, (b) apart. Spreading centers tend to have________ elevations than the ocean floor near them, because of the heat in the rock. (a)Higher, (b)Lower. The deepest places in the ocean occur at deep sea trenches. These are formed at:(a ...
... How do plates move where convection currents are rising: (a) together, (b) apart. Spreading centers tend to have________ elevations than the ocean floor near them, because of the heat in the rock. (a)Higher, (b)Lower. The deepest places in the ocean occur at deep sea trenches. These are formed at:(a ...
Earth`s Crust
... • Where plates come together they form boundaries. • There are three types of boundaries. 1) Divergent 2) Convergent 3) Transform ...
... • Where plates come together they form boundaries. • There are three types of boundaries. 1) Divergent 2) Convergent 3) Transform ...
Plate boundaries| sample answer
... in a process called folding. The uplifted land can be called fold mountains and an example is the Himalayas. Areas in which crust is created are called constructive plate boundaries. An example is a mid ocean ridge, deep under the ocean floor where land is created (Mid-Atlantic ridge has occurred du ...
... in a process called folding. The uplifted land can be called fold mountains and an example is the Himalayas. Areas in which crust is created are called constructive plate boundaries. An example is a mid ocean ridge, deep under the ocean floor where land is created (Mid-Atlantic ridge has occurred du ...
8.1 Earth has several layers
... boundary, tectonic plates move apart. 2.Rift valleys form at divergent boundaries in the ocean and on land. true 3.Divergent boundaries in the ocean are also called spreading centers. true ...
... boundary, tectonic plates move apart. 2.Rift valleys form at divergent boundaries in the ocean and on land. true 3.Divergent boundaries in the ocean are also called spreading centers. true ...
File - 7th Grade Science
... Movement of Plate Boundaries ▪ Go to Page 520 in Owl book. ▪ Follow the instructions step by step. ▪ Answer all questions on a separate piece of paper with your name on it. ...
... Movement of Plate Boundaries ▪ Go to Page 520 in Owl book. ▪ Follow the instructions step by step. ▪ Answer all questions on a separate piece of paper with your name on it. ...
Plate Tectonics
... The magma closer to the core heats and then rises towards the surface as its density decreases. Once the rising magma reaches the lithosphere it moves in opposite directions. ...
... The magma closer to the core heats and then rises towards the surface as its density decreases. Once the rising magma reaches the lithosphere it moves in opposite directions. ...
Earth`s interio
... Earth’s Internal Structure • The Earth’s Crust – Continental crust- sial • Less dense and thicker than oceanic crust – Oceanic crust- sima – Mohorovicic discontinuity CRUST • 5 to 70 Km thick • Oceanic Crust-SIMA – thin (around 7 Km thick) – basaltic – mafic rock – P waves travel + 7 Km/Sec • Contin ...
... Earth’s Internal Structure • The Earth’s Crust – Continental crust- sial • Less dense and thicker than oceanic crust – Oceanic crust- sima – Mohorovicic discontinuity CRUST • 5 to 70 Km thick • Oceanic Crust-SIMA – thin (around 7 Km thick) – basaltic – mafic rock – P waves travel + 7 Km/Sec • Contin ...
to Ch. 9 Notes
... • Denser oceanic slab sinks into the ______________________ • Pockets of magma develop and rise. • Continental ______________________form in part by volcanic activity caused by the subduction of oceanic lithosphere beneath a continent • Examples include the Andes, Cascades, and the _________________ ...
... • Denser oceanic slab sinks into the ______________________ • Pockets of magma develop and rise. • Continental ______________________form in part by volcanic activity caused by the subduction of oceanic lithosphere beneath a continent • Examples include the Andes, Cascades, and the _________________ ...
- Webgeol
... A tectonic plate made up of oceanic crust. The majority of tectonic plates are composed of both continental and oceanic zones. Some, however, are exclusively oceanic, such as the Nazca and the Pacific plates. Pangea Former supercontinent that held together all the land masses of our planet, about 25 ...
... A tectonic plate made up of oceanic crust. The majority of tectonic plates are composed of both continental and oceanic zones. Some, however, are exclusively oceanic, such as the Nazca and the Pacific plates. Pangea Former supercontinent that held together all the land masses of our planet, about 25 ...
Plate Tectonics Vocabulary
... The solid, outer layer of the Earth that consists of the crust and the rigid upper part of the mantle. ...
... The solid, outer layer of the Earth that consists of the crust and the rigid upper part of the mantle. ...
8.3: Plates move apart
... The North and South American plates are moving away from the Eurasian and African plates 11, 000km (6214 mi) from Iceland to Antarctica 24 km (15 mi) wide and 9 km (6 mi) deep ...
... The North and South American plates are moving away from the Eurasian and African plates 11, 000km (6214 mi) from Iceland to Antarctica 24 km (15 mi) wide and 9 km (6 mi) deep ...
THE EARTH`S LITHOSPHERE
... magma on the surface of the mantle or “lithospheric mantle.” Seismic wave velocities in this layer are between 6.5 and 7.8 km per second. ...
... magma on the surface of the mantle or “lithospheric mantle.” Seismic wave velocities in this layer are between 6.5 and 7.8 km per second. ...
Label and Describe the Earth Diagram
... Read the definitions then use the information to color code, label and describe IN YOUR OWN WORDS each section of the diagram below. Definitions: crust – (green) the rigid, rocky outer surface of the Earth, composed mostly of basalt and granite. The crust is the thinnest of all layers. It is thicker ...
... Read the definitions then use the information to color code, label and describe IN YOUR OWN WORDS each section of the diagram below. Definitions: crust – (green) the rigid, rocky outer surface of the Earth, composed mostly of basalt and granite. The crust is the thinnest of all layers. It is thicker ...
AMGEN SUMMER SCIENCE INSTITUTE 2003
... Two sample quizzes and a puzzle activity is given on the following pages. ...
... Two sample quizzes and a puzzle activity is given on the following pages. ...
Theory of Plate Tectonics
... less dense continental plate • Subduction Zone: where the more dense plate slides under the less dense plate • VOLCANOES occur at subduction zones ...
... less dense continental plate • Subduction Zone: where the more dense plate slides under the less dense plate • VOLCANOES occur at subduction zones ...
Unit 7 Test Review
... 1. Theory of plate tectonics- Theory that the Earth’s surface is made of large plates that move around, cause changes in position of the continents and oceans, and result in mountains, trenches, and volcanic rings ...
... 1. Theory of plate tectonics- Theory that the Earth’s surface is made of large plates that move around, cause changes in position of the continents and oceans, and result in mountains, trenches, and volcanic rings ...
The plate tectonic story: a scientific jigsaw
... 100 years ago suggesting that the continents had drifted apart everyone thought he was mad. He wasn’t the first person to notice that the coastlines looked similar. Even Francis Bacon in 16th Century had written about it. But Alfred was the first person to put forward a lot of scientific evidence th ...
... 100 years ago suggesting that the continents had drifted apart everyone thought he was mad. He wasn’t the first person to notice that the coastlines looked similar. Even Francis Bacon in 16th Century had written about it. But Alfred was the first person to put forward a lot of scientific evidence th ...
Chapter 7, Section 1 - Directed Reading B
... of solid rock that flows slowly Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. ...
... of solid rock that flows slowly Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. ...
Oceanography—Plate Tectonics Name
... concept—based on observations of the ocean floor and the relative distance of continents— suggested that the ocean floor was expanding, and that the openings generated by this expansion were volcanically active. Seafloor spreading tells us that new seafloor is created at mid-ocean ridges and is even ...
... concept—based on observations of the ocean floor and the relative distance of continents— suggested that the ocean floor was expanding, and that the openings generated by this expansion were volcanically active. Seafloor spreading tells us that new seafloor is created at mid-ocean ridges and is even ...
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.