File
... The nature of the rock at any area in the crust determines the elevation and whether it is covered with water. ...
... The nature of the rock at any area in the crust determines the elevation and whether it is covered with water. ...
1 Section 4.4 - Sea- Floor Spreading Directions
... 4) Identify several life-forms at the East Pacific Rise. Giant, red tipped tube worms; Giant clams; Spider-like crabs 5) What did the geologic feature at the East Pacific Rise provide for scientists? Some of the best evidence for Wegner’s theory of continental drift 6) What is a mid-ocean Ridge? The ...
... 4) Identify several life-forms at the East Pacific Rise. Giant, red tipped tube worms; Giant clams; Spider-like crabs 5) What did the geologic feature at the East Pacific Rise provide for scientists? Some of the best evidence for Wegner’s theory of continental drift 6) What is a mid-ocean Ridge? The ...
1. Mantle convection causes tectonic plate motion and is
... continues to pull the rest of the plate down with it. 2. Plate tectonic forces are responsible for the slow movement of continents over geologic time. What process occurs in the mantle below a convergent plate boundary? Slab pull because at many convergent boundaries oceanic plates are forced down i ...
... continues to pull the rest of the plate down with it. 2. Plate tectonic forces are responsible for the slow movement of continents over geologic time. What process occurs in the mantle below a convergent plate boundary? Slab pull because at many convergent boundaries oceanic plates are forced down i ...
Slab pull occurs at subduction zones, where denser plate sinks
... continues to pull the rest of the plate down with it. 2. Plate tectonic forces are responsible for the slow movement of continents over geologic time. What process occurs in the mantle below a convergent plate boundary? Slab pull because at many convergent boundaries oceanic plates are forced down i ...
... continues to pull the rest of the plate down with it. 2. Plate tectonic forces are responsible for the slow movement of continents over geologic time. What process occurs in the mantle below a convergent plate boundary? Slab pull because at many convergent boundaries oceanic plates are forced down i ...
Inside Earth: Layers of the Earth
... Scientists called Seismologists (a type of geologist who studies earthquakes) study earthquake waves to “see“ Earth's interior. Waves of energy spread out from an earthquake’s center. These are called seismic waves (Figure to left). Seismic waves change speed as they move through different materials ...
... Scientists called Seismologists (a type of geologist who studies earthquakes) study earthquake waves to “see“ Earth's interior. Waves of energy spread out from an earthquake’s center. These are called seismic waves (Figure to left). Seismic waves change speed as they move through different materials ...
Crust Mantle Core
... 2. In the Find box, type CATEGORY 1 (all caps) 3. In the Replace box, type the category in all caps (for example, PRESIDENTS) ...
... 2. In the Find box, type CATEGORY 1 (all caps) 3. In the Replace box, type the category in all caps (for example, PRESIDENTS) ...
Volcanoes and Igneous Activity Earth
... A subduction zone occurs when one oceanic plate is forced down into the mantle beneath a second plate. Oceanic-Continental • Denser oceanic slab sinks into the asthenosphere. • Pockets of magma develop and rise. • Continental volcanic arcs form in part by volcanic activity caused by the subducti ...
... A subduction zone occurs when one oceanic plate is forced down into the mantle beneath a second plate. Oceanic-Continental • Denser oceanic slab sinks into the asthenosphere. • Pockets of magma develop and rise. • Continental volcanic arcs form in part by volcanic activity caused by the subducti ...
d3 - e-Geowords
... familiar rocks do not extend to great depth. He had just finished equipping a seismic observatory in Zagreb when at some remove an earthquake occurred that his station and others could record.4 Note: seismic wave velocity increases with rock rigidity (which is a proxy for rock density). The arrival ...
... familiar rocks do not extend to great depth. He had just finished equipping a seismic observatory in Zagreb when at some remove an earthquake occurred that his station and others could record.4 Note: seismic wave velocity increases with rock rigidity (which is a proxy for rock density). The arrival ...
Types of Plate Boundaries Ridge Push and Slab Pull
... Identify (name) the type of plate boundary that causes rifts in Earth’s surface. ...
... Identify (name) the type of plate boundary that causes rifts in Earth’s surface. ...
Global Tectonics Summary
... rock melts partially, and the melt rises to form an arc of volcanoes in the overriding plate parallel to the trench. Water vapor and CO2 return to the atmosphere by means of volcanic activity. Continental lithosphere is too buoyant to subduct. When two continental plates converge, therefore, a colli ...
... rock melts partially, and the melt rises to form an arc of volcanoes in the overriding plate parallel to the trench. Water vapor and CO2 return to the atmosphere by means of volcanic activity. Continental lithosphere is too buoyant to subduct. When two continental plates converge, therefore, a colli ...
Notes: Earth/Moon Formation 3/11
... • Increasing weight of outer layers compressed inner layers • Radioactive materials ...
... • Increasing weight of outer layers compressed inner layers • Radioactive materials ...
ch9
... A subduction zone occurs when one oceanic plate is forced down into the mantle beneath a second plate. Oceanic-Continental • Denser oceanic slab sinks into the asthenosphere. • Pockets of magma develop and rise. • Continental volcanic arcs form in part by volcanic activity caused by the subducti ...
... A subduction zone occurs when one oceanic plate is forced down into the mantle beneath a second plate. Oceanic-Continental • Denser oceanic slab sinks into the asthenosphere. • Pockets of magma develop and rise. • Continental volcanic arcs form in part by volcanic activity caused by the subducti ...
Investigations Into The Sources of K and Th Decoupling Across
... of typical unaltered oceanic crust, is sourced from depleted Mid Ocean Ridge Basalt mantle, a composition which makes up roughly 30% of bulk silicate Earth [5]. This represents largely pristine compositions of basalt. The second class is a composition from the Antarctic Dry Valleys, where tectonic u ...
... of typical unaltered oceanic crust, is sourced from depleted Mid Ocean Ridge Basalt mantle, a composition which makes up roughly 30% of bulk silicate Earth [5]. This represents largely pristine compositions of basalt. The second class is a composition from the Antarctic Dry Valleys, where tectonic u ...
Journey to the Center of the Earth Name: Stop 1 – Earth`s Surface
... Why is the lithosphere thinner under the oceans and thicker under the continents? ...
... Why is the lithosphere thinner under the oceans and thicker under the continents? ...
Plate Boundaries
... 100 km thick, although its thickness is age dependent (older lithosphere is thicker).The lithosphere below the crust is brittle enough at some locations to produce earthquakes by faulting, such as within a subducted oceanic plate. Locked fault—a fault that is not slipping because frictional resistan ...
... 100 km thick, although its thickness is age dependent (older lithosphere is thicker).The lithosphere below the crust is brittle enough at some locations to produce earthquakes by faulting, such as within a subducted oceanic plate. Locked fault—a fault that is not slipping because frictional resistan ...
chpt 17 continental drift
... Trenches can form at a convergent boundary. o When trenches form at oceanic-oceanic convergent boundaries, a deep ocean trench is also formed o The Mariana trench is Earth’s deepest trench, still sinking, and is ~ 11 km below the surface of the ocean! ...
... Trenches can form at a convergent boundary. o When trenches form at oceanic-oceanic convergent boundaries, a deep ocean trench is also formed o The Mariana trench is Earth’s deepest trench, still sinking, and is ~ 11 km below the surface of the ocean! ...
2-2 Earth`s Interior
... b. The rocks in the mantle’s second layer are so hot that they melt and become , which means that they begin to flow. ...
... b. The rocks in the mantle’s second layer are so hot that they melt and become , which means that they begin to flow. ...
Plate Tectonics
... he was right, but he couldn’t show what made it work. It would be some 50 years before Wegener was proven correct. ...
... he was right, but he couldn’t show what made it work. It would be some 50 years before Wegener was proven correct. ...
Quiz 4 material 104
... NOTE: the following question (in red) has been omitted this semester (Checkpoint 4.8) in favor of Checkpoint 4.7 (page 83)...One of your homework questions for this chapter asks you to explain how the following patterns can be interpreted to contradict the contracting Earth model: 1) topography of ...
... NOTE: the following question (in red) has been omitted this semester (Checkpoint 4.8) in favor of Checkpoint 4.7 (page 83)...One of your homework questions for this chapter asks you to explain how the following patterns can be interpreted to contradict the contracting Earth model: 1) topography of ...
The Regular Distribution of Intraplate Volcanism
... chain sequence as expected from the plume head-tail model (Clouard and Bonneville 2001). Non-linear age progressions are found in many island chains, including the Cook-Austral-Marquesas, Marshall-Gilberts, and Line Islands. Even the HawaiianEmperor chain, generally considered the archetypical examp ...
... chain sequence as expected from the plume head-tail model (Clouard and Bonneville 2001). Non-linear age progressions are found in many island chains, including the Cook-Austral-Marquesas, Marshall-Gilberts, and Line Islands. Even the HawaiianEmperor chain, generally considered the archetypical examp ...
Continental geotherm and the evolution of rifted margins
... (Perez-Gussinye et al., 2001). The little melt produced will be enriched in incompatible elements (Maaloe, 1985), as are those few basalts that have been sampled within the continent-ocean transition west of Iberia (Seyfert and Brunotte, 1996). In our model, true seafloor spreading only begins at a ...
... (Perez-Gussinye et al., 2001). The little melt produced will be enriched in incompatible elements (Maaloe, 1985), as are those few basalts that have been sampled within the continent-ocean transition west of Iberia (Seyfert and Brunotte, 1996). In our model, true seafloor spreading only begins at a ...
Mantle plume
A mantle plume is a mechanism proposed in 1971 to explain volcanic regions of the earth that were not thought to be explicable by the then-new theory of plate tectonics. Some such volcanic regions lie far from tectonic plate boundaries, for example, Hawaii. Others represent unusually large-volume volcanism, whether on plate boundaries, e.g. Iceland, or basalt floods such as the Deccan or Siberian traps.A mantle plume is posited to exist where hot rock nucleates at the core-mantle boundary and rises through the Earth's mantle becoming a diapir in the Earth's crust. The currently active volcanic centers are known as ""hot spots"". In particular, the concept that mantle plumes are fixed relative to one another, and anchored at the core-mantle boundary, was thought to provide a natural explanation for the time-progressive chains of older volcanoes seen extending out from some such hot spots, such as the Hawaiian–Emperor seamount chain.The hypothesis of mantle plumes from depth is not universally accepted as explaining all such volcanism. It has required progressive hypothesis-elaboration leading to variant propositions such as mini-plumes and pulsing plumes. Another hypothesis for unusual volcanic regions is the ""Plate model"". This proposes shallower, passive leakage of magma from the mantle onto the Earth's surface where extension of the lithosphere permits it, attributing most volcanism to plate tectonic processes, with volcanoes far from plate boundaries resulting from intraplate extension.