Directed Reading A
... 28. What happens to the ocean floor the farther the oceanic lithosphere is from a mid-ocean ridge? ...
... 28. What happens to the ocean floor the farther the oceanic lithosphere is from a mid-ocean ridge? ...
FREE Sample Here
... there would have been more than one in the past, though this would have been required to explain the different polar wander paths of the different continents. The only other possible explanation is that the continents were once joined and have since moved apart. [p. 36] 9. What evidence is there tha ...
... there would have been more than one in the past, though this would have been required to explain the different polar wander paths of the different continents. The only other possible explanation is that the continents were once joined and have since moved apart. [p. 36] 9. What evidence is there tha ...
In geologic terms, a plate is a large, rigid slab of solid rock. The word
... a major role in shaping the Earth's surface. This way of thinking was known as "catastrophism," and geology (the study of the Earth) was based on the belief that all earthly changes were sudden and caused by a series of catastrophes. However, by the mid-19th century, catastrophism gave way to "unifo ...
... a major role in shaping the Earth's surface. This way of thinking was known as "catastrophism," and geology (the study of the Earth) was based on the belief that all earthly changes were sudden and caused by a series of catastrophes. However, by the mid-19th century, catastrophism gave way to "unifo ...
Deep Ocean Technology & The Ocean Floor
... •The abyssal plain is the broad, flat part of the ocean floor. •An ocean trench is a deep canyon on the ocean floor. They form where one tectonic plate is pushed under another. ...
... •The abyssal plain is the broad, flat part of the ocean floor. •An ocean trench is a deep canyon on the ocean floor. They form where one tectonic plate is pushed under another. ...
Uncharted Territory (1170L)
... lot of the technology we've been using up to now was deployed with wires from the surface ship," German says. That doesn't lend itself to prolonged, precise searches on the seafloor, he adds. German and others are developing a new breed of robot, known as autonomous underwater vehicles, that isn't l ...
... lot of the technology we've been using up to now was deployed with wires from the surface ship," German says. That doesn't lend itself to prolonged, precise searches on the seafloor, he adds. German and others are developing a new breed of robot, known as autonomous underwater vehicles, that isn't l ...
The Ocean Floor
... In the following diagram there is evidence of seafloor spreading by showing the ages of the ocean floor. The red colors are the youngest parts of the seafloor, where fresh new crust is formed as lava seeps up from the deep interior of the Earth at spreading ridges. The green colors are the spreading ...
... In the following diagram there is evidence of seafloor spreading by showing the ages of the ocean floor. The red colors are the youngest parts of the seafloor, where fresh new crust is formed as lava seeps up from the deep interior of the Earth at spreading ridges. The green colors are the spreading ...
LECTURE W14-15-L29-30
... Figure 17-6. Sr vs. Nd isotopic ratios for the three zones of the Andes. Data from James et al. (1976), Hawkesworth et al. (1979), James (1982), Harmon et al. (1984), Frey et al. (1984), Thorpe et al. (1984), Hickey et al. (1986), Hildreth and Moorbath (1988), Geist (pers. comm), Davidson (pers. co ...
... Figure 17-6. Sr vs. Nd isotopic ratios for the three zones of the Andes. Data from James et al. (1976), Hawkesworth et al. (1979), James (1982), Harmon et al. (1984), Frey et al. (1984), Thorpe et al. (1984), Hickey et al. (1986), Hildreth and Moorbath (1988), Geist (pers. comm), Davidson (pers. co ...
Earth Structure: A Virtual Journey to the Center of
... Compositional layers There are two major types of crust: crust that makes up the ocean floors and crust that makes up the continents. Oceanic crust is composed entirely of basalt extruded at mid-ocean ridges , resulting in a thin (~ 5 km), relatively dense crust (~3.0 g/cm3). Continental crust , on ...
... Compositional layers There are two major types of crust: crust that makes up the ocean floors and crust that makes up the continents. Oceanic crust is composed entirely of basalt extruded at mid-ocean ridges , resulting in a thin (~ 5 km), relatively dense crust (~3.0 g/cm3). Continental crust , on ...
Forum Reply
... note that the sole evidence for both their 200 and 100 Ma “alternative reconstructions” provided to the reader is a blue and a green dot, respectively, in the inset diagram in their Fig. 1 (reproduced from our paper). If they had provided alternative age grids for these times, then we would be in a ...
... note that the sole evidence for both their 200 and 100 Ma “alternative reconstructions” provided to the reader is a blue and a green dot, respectively, in the inset diagram in their Fig. 1 (reproduced from our paper). If they had provided alternative age grids for these times, then we would be in a ...
1 INTERNATIONAL LITHOSPHERE PROGRAM (ILP) Proposal for
... Scientific rationale and objectives. The subduction of the continental lithosphere into Earth’s interior leads to dramatic changes in the dynamics of the mantle as well as seismic and volcanic activities at the convergent systems. The geological processes that resulted from the continental crust-man ...
... Scientific rationale and objectives. The subduction of the continental lithosphere into Earth’s interior leads to dramatic changes in the dynamics of the mantle as well as seismic and volcanic activities at the convergent systems. The geological processes that resulted from the continental crust-man ...
Ch 17-19 Study Guide with embedded grid
... What is the theory of seafloor spreading? ______________________________________ What evidence shows us that the seafloor has/is spreading? ...
... What is the theory of seafloor spreading? ______________________________________ What evidence shows us that the seafloor has/is spreading? ...
Sample
... 38) Describe the mechanisms of Ridge-push and Slab-pull and explain which one is the more important process in driving plate tectonics. Bloom's Taxonomy: Comprehension 39) Volcanic activity can result from Hot Spot activity and Divergent plate boundaries. Explain where and how the magma for each of ...
... 38) Describe the mechanisms of Ridge-push and Slab-pull and explain which one is the more important process in driving plate tectonics. Bloom's Taxonomy: Comprehension 39) Volcanic activity can result from Hot Spot activity and Divergent plate boundaries. Explain where and how the magma for each of ...
Appalachian Mountains
... Earth’s Topography When Earth’s topography is plotted on a graph, a pattern in the distribution of elevations emerges. Most of Earth’s elevations cluster around two main ranges of elevation—0 to 1 km above sea level and 4 to 5 km ...
... Earth’s Topography When Earth’s topography is plotted on a graph, a pattern in the distribution of elevations emerges. Most of Earth’s elevations cluster around two main ranges of elevation—0 to 1 km above sea level and 4 to 5 km ...
tectonic boundary quiz
... 3. Oceanic oceanic convergent At this boundary, two plates come together and create a deep ocean trench and island arc. 4. Continental continental convergent At this boundary, folded mountain ranges occur. 5. Oceanic continental convergent At this boundary, two plates come together to create a shall ...
... 3. Oceanic oceanic convergent At this boundary, two plates come together and create a deep ocean trench and island arc. 4. Continental continental convergent At this boundary, folded mountain ranges occur. 5. Oceanic continental convergent At this boundary, two plates come together to create a shall ...
Hide and Seep - La Brea Tar Pits and Museum
... organic materials. The movement of the earth’s crust and uppermost mantle. Tectonic plates move in relation to one another at one of three types of plate boundaries: convergent boundaries, divergent boundaries, and transform boundaries. Earthquakes and volcanoes are the results of plate movement. ...
... organic materials. The movement of the earth’s crust and uppermost mantle. Tectonic plates move in relation to one another at one of three types of plate boundaries: convergent boundaries, divergent boundaries, and transform boundaries. Earthquakes and volcanoes are the results of plate movement. ...
Fold Movement – Teacher Notes File
... 2. Plates Moving Together - The Continental Crust Crumples and Shortens When plastic rocks move together they crumple and form folds. A demonstration of folding can be made using soft fabrics such as towels pressed together by large books. ...
... 2. Plates Moving Together - The Continental Crust Crumples and Shortens When plastic rocks move together they crumple and form folds. A demonstration of folding can be made using soft fabrics such as towels pressed together by large books. ...
Geology
... Hypogene processes means all internal processes which is lead to either a quick processes like earthquakes and volcanoes or slow processes ike oroginic movement. plate tectonic theory explains this processes. ...
... Hypogene processes means all internal processes which is lead to either a quick processes like earthquakes and volcanoes or slow processes ike oroginic movement. plate tectonic theory explains this processes. ...
Plate Tectonics
... Fundamental Geologic Principle #1: Law of Original Horizontality As early as the 17th century, Nicolas Steno (1638-1686) first proposed two concepts that field geologists use every day. The first concept stated that regardless of how intricately the sedimentary rocks exposed in an outcrop are fol ...
... Fundamental Geologic Principle #1: Law of Original Horizontality As early as the 17th century, Nicolas Steno (1638-1686) first proposed two concepts that field geologists use every day. The first concept stated that regardless of how intricately the sedimentary rocks exposed in an outcrop are fol ...
Sigmundsson pages
... when two of these plates diverge. Divergent plate movements cause a buildup of tensional stress that is released in a process known as rifting. This consists of periods of large-scale faulting (the slippage of adjacent rock masses at fractures in Earth’s crust) and/or volcanic and magmatic activity. ...
... when two of these plates diverge. Divergent plate movements cause a buildup of tensional stress that is released in a process known as rifting. This consists of periods of large-scale faulting (the slippage of adjacent rock masses at fractures in Earth’s crust) and/or volcanic and magmatic activity. ...
The Dynamic Earth
... layer is the lithosphere. It is a cool, rigid layer that is 15 km to 300 km thick that includes the crust and uppermost part of the mantle. It is divided into huge pieces called tectonic plates. The asthenosphere is the layer beneath the lithosphere. The asthenosphere is a plastic, solid layer of th ...
... layer is the lithosphere. It is a cool, rigid layer that is 15 km to 300 km thick that includes the crust and uppermost part of the mantle. It is divided into huge pieces called tectonic plates. The asthenosphere is the layer beneath the lithosphere. The asthenosphere is a plastic, solid layer of th ...
Geology of National Parks
... Describe how the sizes of earthquakes and volcanoes are measured or characterized. E3.4C Describe the effects of earthquakes and volcanic eruptions on humans. E3.4d Explain how the chemical composition of magmas relates to plate tectonics and affects the geometry, structure, and explosivity of volca ...
... Describe how the sizes of earthquakes and volcanoes are measured or characterized. E3.4C Describe the effects of earthquakes and volcanic eruptions on humans. E3.4d Explain how the chemical composition of magmas relates to plate tectonics and affects the geometry, structure, and explosivity of volca ...
effects of ridge subduction on upper plate deformations: the juan
... of the ridge geometry below South America shows it coincides with the flatter and longer segment of the Central Chile flat-slab (Yañez et al., 2001). The present-day horizontal subduction is clearly illustrated by seismicity at 31°S (Pardo et al., 2002). It provides evidence for the friction now exi ...
... of the ridge geometry below South America shows it coincides with the flatter and longer segment of the Central Chile flat-slab (Yañez et al., 2001). The present-day horizontal subduction is clearly illustrated by seismicity at 31°S (Pardo et al., 2002). It provides evidence for the friction now exi ...
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.