Intro2-3
... landforms. When two ocean plates collide, they may form deep valleys on the ocean’s floor. When ocean plates collide with continental plates, mountain ranges are formed. Mountains are also created when two continental plates collide. When plates separate, usually on the ocean floor, they cause gaps ...
... landforms. When two ocean plates collide, they may form deep valleys on the ocean’s floor. When ocean plates collide with continental plates, mountain ranges are formed. Mountains are also created when two continental plates collide. When plates separate, usually on the ocean floor, they cause gaps ...
Document
... sentence using the term; third row: the boundary where tectonic plates move apart; Convergent Boundary: top row: sketch of a convergent boundary; second row: a sentence using the term; third row: the boundary where tectonic plates push together; Transform Boundary: top row: sketch of a transform bou ...
... sentence using the term; third row: the boundary where tectonic plates move apart; Convergent Boundary: top row: sketch of a convergent boundary; second row: a sentence using the term; third row: the boundary where tectonic plates push together; Transform Boundary: top row: sketch of a transform bou ...
Magnetic strips in ocean-floor rocks
... The process of sea-floor spreading • Harry Hess believed that the mid-ocean ridges and deep-ocean trenches might help to explain how ocean floor was formed. • His hypothesis was ‘ in the process of sea-floor spreading, new ocean floor forms along Earth’s mid-ocean ridges, slowly moves outward acros ...
... The process of sea-floor spreading • Harry Hess believed that the mid-ocean ridges and deep-ocean trenches might help to explain how ocean floor was formed. • His hypothesis was ‘ in the process of sea-floor spreading, new ocean floor forms along Earth’s mid-ocean ridges, slowly moves outward acros ...
lecture7_tomo
... 2. Other arcs show the effect of addition of different continental components to source, most likely Atlantic sediment (Antilles) or Pacific sediment (Banda, New Zealand). The basaltic lavas are more enriched in radioactive elements (more “original” or “primordial”) and more gassed. These are often ...
... 2. Other arcs show the effect of addition of different continental components to source, most likely Atlantic sediment (Antilles) or Pacific sediment (Banda, New Zealand). The basaltic lavas are more enriched in radioactive elements (more “original” or “primordial”) and more gassed. These are often ...
Earthquakes
... Henan, Gansu, Hebei, Shandong, Jiangsu, and Anhui were affected. A 520 mile- wide area was destroyed and in some counties, 60% of the population was killed. ...
... Henan, Gansu, Hebei, Shandong, Jiangsu, and Anhui were affected. A 520 mile- wide area was destroyed and in some counties, 60% of the population was killed. ...
SEISMIC ACTIVITY (mainly shallow earthquakes)
... What is the water depth above 16 myr old ocean floor? D = 0.336√16 + 2.5km = 3.8 km The graph shows depth of the ocean as a function of age out from a ridge. Empirical studies show that the subsidence follows another curve: D = 6.4 - 3,2e-t/62,8 when the ocean floor gets older than 70 myr. Again thi ...
... What is the water depth above 16 myr old ocean floor? D = 0.336√16 + 2.5km = 3.8 km The graph shows depth of the ocean as a function of age out from a ridge. Empirical studies show that the subsidence follows another curve: D = 6.4 - 3,2e-t/62,8 when the ocean floor gets older than 70 myr. Again thi ...
A Brief Introduction to the Earth`s Surface
... The shape of the Earth’s surface at all scales, from individual landforms up to mountain ranges and ocean basins, is defined by the distribution of elevation. For convenience, we measure elevation relative to mean sea level. Obviously this datum is well defined around the coasts, but it has to be es ...
... The shape of the Earth’s surface at all scales, from individual landforms up to mountain ranges and ocean basins, is defined by the distribution of elevation. For convenience, we measure elevation relative to mean sea level. Obviously this datum is well defined around the coasts, but it has to be es ...
Inside the Earth - Madison County Schools
... Exploring Inside Earth • Geologists have used two main types of evidence to learn about Earth’s interior: direct evidence from rock samples and indirect evidence from seismic waves. ...
... Exploring Inside Earth • Geologists have used two main types of evidence to learn about Earth’s interior: direct evidence from rock samples and indirect evidence from seismic waves. ...
Great Ideas in Science: Lecture 9 – Earth as a Planet
... – Air heated and rises – Cools and sinks ...
... – Air heated and rises – Cools and sinks ...
File
... We have found out about the Earth’s structure by studying the paths of earthquake waves as they travel through the Earth’s interior, and by studying evidence of volcanic eruptions which bring material from deep within the Earth’s interior to the surface. Deeper parts of the earth are studied indirec ...
... We have found out about the Earth’s structure by studying the paths of earthquake waves as they travel through the Earth’s interior, and by studying evidence of volcanic eruptions which bring material from deep within the Earth’s interior to the surface. Deeper parts of the earth are studied indirec ...
DR Fossil Record
... _____ 23. Fossils provide evidence that Antarctica was once located a. at the North Pole. c. at the South Pole. b. near the equator. d. where it is now. _____ 24. The continents may once have formed one landmass called Pangaea which means a. all seas. c. all Earth. b. puzzle. d. landmass. _____ 25. ...
... _____ 23. Fossils provide evidence that Antarctica was once located a. at the North Pole. c. at the South Pole. b. near the equator. d. where it is now. _____ 24. The continents may once have formed one landmass called Pangaea which means a. all seas. c. all Earth. b. puzzle. d. landmass. _____ 25. ...
Elements of Earth Science The Earth: Inside and Out
... Context: Convection currents slowly move the material in the asthenosphere, causing Earth’s tectonic plates to shift. continental drift Definition: The slow movement of tectonic plates that causes continents to move toward and away from each other Context: Alfred Wegener believed that all the contin ...
... Context: Convection currents slowly move the material in the asthenosphere, causing Earth’s tectonic plates to shift. continental drift Definition: The slow movement of tectonic plates that causes continents to move toward and away from each other Context: Alfred Wegener believed that all the contin ...
Web page 1
... areas of the Farallon plate stalled and their corresponding downgoing slabs broke away. 20-18 Ma : The Monterey plate stalled just before its capture by the Pacific plate. This was followed about 1-2 million years later by the capture of the Arguello as it too stalled. At this point the San Andreas ...
... areas of the Farallon plate stalled and their corresponding downgoing slabs broke away. 20-18 Ma : The Monterey plate stalled just before its capture by the Pacific plate. This was followed about 1-2 million years later by the capture of the Arguello as it too stalled. At this point the San Andreas ...
LAB 2
... Shows us that the Earth is LAYERED The core must be made of a different material than the mantle to make the waves refract ...
... Shows us that the Earth is LAYERED The core must be made of a different material than the mantle to make the waves refract ...
GEOL 100 Survey of Geology
... B. Demonstrate an understanding of the Earth's systems, cycles and processes, how they interact, and how they change the Earth on both a human timescale and a geologic timescale C. Demonstrate an understanding of the structure, materials, internal processes and external processes of the Earth within ...
... B. Demonstrate an understanding of the Earth's systems, cycles and processes, how they interact, and how they change the Earth on both a human timescale and a geologic timescale C. Demonstrate an understanding of the structure, materials, internal processes and external processes of the Earth within ...
Plate Tectonics
... Destructive plate boundary A destructive plate boundary is found where a continental plate meets an oceanic plate. The oceanic plate descends under the continental plate because it is denser. As the plate descends it starts to melt due to the friction caused by the movement between the plates. This ...
... Destructive plate boundary A destructive plate boundary is found where a continental plate meets an oceanic plate. The oceanic plate descends under the continental plate because it is denser. As the plate descends it starts to melt due to the friction caused by the movement between the plates. This ...
Plate Tectonics
... Destructive plate boundary A destructive plate boundary is found where a continental plate meets an oceanic plate. The oceanic plate descends under the continental plate because it is denser. As the plate descends it starts to melt due to the friction caused by the movement between the plates. This ...
... Destructive plate boundary A destructive plate boundary is found where a continental plate meets an oceanic plate. The oceanic plate descends under the continental plate because it is denser. As the plate descends it starts to melt due to the friction caused by the movement between the plates. This ...
Deformation of Crust
... Collisions Between Oceanic Crust and Oceanic Crust Volcanic mountains sometimes form where two plates with oceanic crust at their edges collide ...
... Collisions Between Oceanic Crust and Oceanic Crust Volcanic mountains sometimes form where two plates with oceanic crust at their edges collide ...
Ocean Basin
... wide and rises 1000 to 3000 m above the adjacent seafloor. 4.The mid-ocean ridge is 60,000 km long and covers 21% of Earth's surface. 5. Many portions of the ridge have valleys that run along the crest of the ridge. These are called central or axial rift valleys. ...
... wide and rises 1000 to 3000 m above the adjacent seafloor. 4.The mid-ocean ridge is 60,000 km long and covers 21% of Earth's surface. 5. Many portions of the ridge have valleys that run along the crest of the ridge. These are called central or axial rift valleys. ...
The Truth About Alfred Wegner
... into the Earth’s deep interior at the ocean trenches. This “recycling” process, later named “seafloor spreading,” carries off older sediment and fossils, and moves the continents as new ocean crust spreads away from the ridges. Supporting Wegener’s theory of continental drift, Hess explained how the ...
... into the Earth’s deep interior at the ocean trenches. This “recycling” process, later named “seafloor spreading,” carries off older sediment and fossils, and moves the continents as new ocean crust spreads away from the ridges. Supporting Wegener’s theory of continental drift, Hess explained how the ...
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.