Key Plate Tectonics Terminology (earthquakes and volcanoes)
... P-wave: The primary or fastest wave traveling away from a seismic event through the solid rock, and consisting of a train of compressions and dilations of the material. Richter Scale This measures the strength of the earthquake Sea-floor spreading: The mechanism by which new sea floor crust is creat ...
... P-wave: The primary or fastest wave traveling away from a seismic event through the solid rock, and consisting of a train of compressions and dilations of the material. Richter Scale This measures the strength of the earthquake Sea-floor spreading: The mechanism by which new sea floor crust is creat ...
Eratosthenes
... the Tropic of Cancer and modern Aswan) where sunlight only struck the bottom of the well on the summer solstice, Eratosthenes determined that he could discover the circumference of the earth. •Eratosthenes measured the altitude of the noontime sun at Alexandria at its maximum on Jun 21st. • Erastost ...
... the Tropic of Cancer and modern Aswan) where sunlight only struck the bottom of the well on the summer solstice, Eratosthenes determined that he could discover the circumference of the earth. •Eratosthenes measured the altitude of the noontime sun at Alexandria at its maximum on Jun 21st. • Erastost ...
Chapter 17: Plate Tectonics
... What You’ll Learn • Why continental drift was not accepted when it was first proposed and what kinds of evidence led to its acceptance. ...
... What You’ll Learn • Why continental drift was not accepted when it was first proposed and what kinds of evidence led to its acceptance. ...
Chapter 17 - Heritage Collegiate
... mantle, outer core, and inner core (see Figure 17.6 p. 476 text). 1. Crust – the solid, relatively thin outer layer of the earth that ranges in thickness from 3km at ocean ridges to around 70km in some continental mountain ranges. It is comprised mostly of low density elements (recall Table 2.3, p. ...
... mantle, outer core, and inner core (see Figure 17.6 p. 476 text). 1. Crust – the solid, relatively thin outer layer of the earth that ranges in thickness from 3km at ocean ridges to around 70km in some continental mountain ranges. It is comprised mostly of low density elements (recall Table 2.3, p. ...
EARTH`S INTERIOR
... • The inner core is a dense ball of solid metal. In the inner core, extreme pressure squeezes the atoms of iron and nickel so much that they cannot spread out and become liquid. ...
... • The inner core is a dense ball of solid metal. In the inner core, extreme pressure squeezes the atoms of iron and nickel so much that they cannot spread out and become liquid. ...
EARTH`S INTERIOR
... • The inner core is a dense ball of solid metal. In the inner core, extreme pressure squeezes the atoms of iron and nickel so much that they cannot spread out and become liquid. ...
... • The inner core is a dense ball of solid metal. In the inner core, extreme pressure squeezes the atoms of iron and nickel so much that they cannot spread out and become liquid. ...
Chapter 5
... Continent-toOcean-to-Continent Ocean-to-Ocean Continent Colder, denser slab is forced down, forming a trench; water is released and melts rocks, forming magma. ...
... Continent-toOcean-to-Continent Ocean-to-Ocean Continent Colder, denser slab is forced down, forming a trench; water is released and melts rocks, forming magma. ...
Earthquakes - Pitt County Schools
... • _____________ oceanic slabs _______________ and one descends beneath the other. • This kind of _________________ often forms _________________ on the ocean floor. • Volcanic island arcs form as volcanoes emerge from the _________. • Examples include the Aleutian, Mariana, and ________________ isla ...
... • _____________ oceanic slabs _______________ and one descends beneath the other. • This kind of _________________ often forms _________________ on the ocean floor. • Volcanic island arcs form as volcanoes emerge from the _________. • Examples include the Aleutian, Mariana, and ________________ isla ...
PLATE BOUNDARIES AND CALIFORNIA
... Colder, denser slab is forced down, forming a trench; water is released and melts rocks, forming magma. ...
... Colder, denser slab is forced down, forming a trench; water is released and melts rocks, forming magma. ...
PLATE BOUNDARIES AND CALIFORNIA
... Colder, denser slab is forced down, forming a trench; water is released and melts rocks, forming magma. ...
... Colder, denser slab is forced down, forming a trench; water is released and melts rocks, forming magma. ...
Benchmark (IMEDL 2004)
... deformation distributed and the topography small. It also allows for the initial uniform stretching of the lithosphere. Serpentinization and weakening both control the final asymmetry. A weak (wet) mantle reduces the thickness of the brittle lithosphere and the force needed to stretch it. A strong m ...
... deformation distributed and the topography small. It also allows for the initial uniform stretching of the lithosphere. Serpentinization and weakening both control the final asymmetry. A weak (wet) mantle reduces the thickness of the brittle lithosphere and the force needed to stretch it. A strong m ...
Plate tectonic phenomena in the Southern Poland and adjacent areas
... oceanic type plates are much thinner, c.a 8 km, and are composed of more dense mafic rocks with high content of minerals such as olivines. Plate’s velocities usually do not exceed 10 cm/year, however in the past even the large cratons like Baltica or Laurentia might reached velocities up to 20 cm/ye ...
... oceanic type plates are much thinner, c.a 8 km, and are composed of more dense mafic rocks with high content of minerals such as olivines. Plate’s velocities usually do not exceed 10 cm/year, however in the past even the large cratons like Baltica or Laurentia might reached velocities up to 20 cm/ye ...
Plate motion, earthquakes, and volcanoes
... The measure of how strong the earthquake is Higher numbers means that the earthquake is stronger ...
... The measure of how strong the earthquake is Higher numbers means that the earthquake is stronger ...
Chapter 2
... Positive geoid anomalies of up to 10 – 15 m associated with a number of midocean ridge segments, as well as age-correlated geoid offsets across fracture zones imply that ageing of the ocean lithosphere is accompanied by a decline in potential energy. The geoid anomaly predicted for the cooling half- ...
... Positive geoid anomalies of up to 10 – 15 m associated with a number of midocean ridge segments, as well as age-correlated geoid offsets across fracture zones imply that ageing of the ocean lithosphere is accompanied by a decline in potential energy. The geoid anomaly predicted for the cooling half- ...
LPS Math-Science Partnership Grant
... forever. About 500 million years ago both European and American continents started to close in on each other. Underneath the ocean, cold dense oceanic crust was diving down under the lighter continental crust moving the continents ever closer- the process is called subduction. Slowly the Iapetus oce ...
... forever. About 500 million years ago both European and American continents started to close in on each other. Underneath the ocean, cold dense oceanic crust was diving down under the lighter continental crust moving the continents ever closer- the process is called subduction. Slowly the Iapetus oce ...
![Wegener Reading [Biography]](http://s1.studyres.com/store/data/004189784_1-5fd15e1925a2c907481f1ec648102120-300x300.png)
Wegener Reading [Biography]
... (click on the picture at the left to see a map of the age of the ocean crust). Where plates collide, great mountain ranges may be pushed up, such as the Himalayas; or if one plate sinks below another, deep oceanic trenches and chains of volcanoes are formed. Earthquakes are by far most common along ...
... (click on the picture at the left to see a map of the age of the ocean crust). Where plates collide, great mountain ranges may be pushed up, such as the Himalayas; or if one plate sinks below another, deep oceanic trenches and chains of volcanoes are formed. Earthquakes are by far most common along ...
The Earth
... Earth 9 tectonics Key points to modern version: 1. Strong, rigid crust (lithosphere) including uppermost mantle plus the crust 2. Weaker region of the mantle (asthenosphere) that is molten (location of convection cells) 3. Lithosphere broken into numerous segments or plates that are in motion and c ...
... Earth 9 tectonics Key points to modern version: 1. Strong, rigid crust (lithosphere) including uppermost mantle plus the crust 2. Weaker region of the mantle (asthenosphere) that is molten (location of convection cells) 3. Lithosphere broken into numerous segments or plates that are in motion and c ...
Internal Structure of the Earth
... –Crust has P-wave velocities <8 km/sec BY DEFINITION (usually 5.5-7.2 km/sec) •Continental crust is granodiorite-like and usually about 35 km thick, going up to 70-100 in collision zones. In areas of extension, it can be thinner. The lower part of continental crust is plastic. •Oceanic crust is basa ...
... –Crust has P-wave velocities <8 km/sec BY DEFINITION (usually 5.5-7.2 km/sec) •Continental crust is granodiorite-like and usually about 35 km thick, going up to 70-100 in collision zones. In areas of extension, it can be thinner. The lower part of continental crust is plastic. •Oceanic crust is basa ...
questions
... continents had drifted apart over time to form the present continents. This rearrangement of continents is known as continental drift. Wegener published his first complete statement on continental drift in 1912. He supported his research by attempting to piece together the edges of the continents in ...
... continents had drifted apart over time to form the present continents. This rearrangement of continents is known as continental drift. Wegener published his first complete statement on continental drift in 1912. He supported his research by attempting to piece together the edges of the continents in ...
13.7 plate tectonics MH - The University of Texas at Dallas
... researchers are hoping to settle the matter with a field trip. An excursion is already planned for next year, to re-examine the evidence for plate tectonics in the western Pilbara. Field trips don’t always resolve things. In the Wind River Mountains, the meeting attendees continued to argue about pl ...
... researchers are hoping to settle the matter with a field trip. An excursion is already planned for next year, to re-examine the evidence for plate tectonics in the western Pilbara. Field trips don’t always resolve things. In the Wind River Mountains, the meeting attendees continued to argue about pl ...
Chapter 1: Philosophy and Fundamental Concepts
... continental 20-35 km thick intermediate to felsic 27-28 g/cm3 ...
... continental 20-35 km thick intermediate to felsic 27-28 g/cm3 ...
Layers of the earth new
... • Thinnest layer of the Earth that ranges from only 2 miles in some areas of the ocean floor to 75 miles deep under mountains • Made up of large amounts of silicon and aluminum • Two types of crust: oceanic crust and continental crust • Composed of plates on which the continents and oceans rest ...
... • Thinnest layer of the Earth that ranges from only 2 miles in some areas of the ocean floor to 75 miles deep under mountains • Made up of large amounts of silicon and aluminum • Two types of crust: oceanic crust and continental crust • Composed of plates on which the continents and oceans rest ...
Activity 2 Modelling Convection Currents
... difference is that, in step 5, the heat source in the centre creates a convection current on either side of the heat source. 2. Answers will vary, but should summarize the relationship as follows. The Earth’s giant internal convection current is the driving force of plate tectonics. The less dense, ...
... difference is that, in step 5, the heat source in the centre creates a convection current on either side of the heat source. 2. Answers will vary, but should summarize the relationship as follows. The Earth’s giant internal convection current is the driving force of plate tectonics. The less dense, ...
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.