Plate Tectonics II - Clark Science Center
... separate zones of convection, one in the asthenosphere and the other in the lower mantle. According to this model, there is very little mixing between the two layers, and slabs of lithosphere either melt or pile up at the bottom of the asthenosphere. ...
... separate zones of convection, one in the asthenosphere and the other in the lower mantle. According to this model, there is very little mixing between the two layers, and slabs of lithosphere either melt or pile up at the bottom of the asthenosphere. ...
FREE Sample Here
... a. Rocks on the ocean floor are oldest in the center, becoming progressively younger toward each continent. b. Rocks on the continents can be traced through the ocean floor to the other side. c. Anthropologists have found human carvings in Africa that match those in Brazil. d. Glaciers near the mout ...
... a. Rocks on the ocean floor are oldest in the center, becoming progressively younger toward each continent. b. Rocks on the continents can be traced through the ocean floor to the other side. c. Anthropologists have found human carvings in Africa that match those in Brazil. d. Glaciers near the mout ...
FREE Sample Here
... a. Subduction zones are areas where ocean floor descends into the mantle. b. Subduction zone activity includes very large earthquakes. c. Subduction zone activity leads to active volcanoes. d. Subduction zones are areas where ocean floor rocks are formed. e. Subduction zones are marked as the deepes ...
... a. Subduction zones are areas where ocean floor descends into the mantle. b. Subduction zone activity includes very large earthquakes. c. Subduction zone activity leads to active volcanoes. d. Subduction zones are areas where ocean floor rocks are formed. e. Subduction zones are marked as the deepes ...
6. Along which type(s) of lithospheric plate
... 10. Near which type of lithospheric plate boundary are andesite stratovolcanoes most common? a. rift zones on continents b. collision zones between continental plates c. subduction zones between oceanic and continental plates d. subduction zones between two continents e. transform fault boundaries b ...
... 10. Near which type of lithospheric plate boundary are andesite stratovolcanoes most common? a. rift zones on continents b. collision zones between continental plates c. subduction zones between oceanic and continental plates d. subduction zones between two continents e. transform fault boundaries b ...
Mass Extinction - ScienceA2Z.com
... •Affected primarily marine life •Reef building organisms almost completely destroyed •Primary cause: Ocean anoxia •Possible Causes for Anoxia: Global cooling, oceanic volcanism, meteor impact •Extinction caused by speciation rather than extinctions ...
... •Affected primarily marine life •Reef building organisms almost completely destroyed •Primary cause: Ocean anoxia •Possible Causes for Anoxia: Global cooling, oceanic volcanism, meteor impact •Extinction caused by speciation rather than extinctions ...
PLATE TECTONICS
... up of rocks that are less dense than oceanic crust – The ocean floor is made up of oceanic crust, which is made up of rocks that are more dense than continental crust ...
... up of rocks that are less dense than oceanic crust – The ocean floor is made up of oceanic crust, which is made up of rocks that are more dense than continental crust ...
Plate Tectonics
... Ancient Climatic Evidence Wegener studied sedimentary rocks and found evidence of widespread climate change. Coal deposits in Antarctica suggest that plants once lived in Antarctica; therefore Antarctica was once closer to the equator. ...
... Ancient Climatic Evidence Wegener studied sedimentary rocks and found evidence of widespread climate change. Coal deposits in Antarctica suggest that plants once lived in Antarctica; therefore Antarctica was once closer to the equator. ...
File
... • The more dense of the 2 will go under and form a subduction zone / OCEAN TRENCH • The new mantle material produced from the melting of the subducted plate will eventually resurface to produce chain of volcanic islands on the ocean floor called ISLAND ARCS • As magma accumulates over time, the volc ...
... • The more dense of the 2 will go under and form a subduction zone / OCEAN TRENCH • The new mantle material produced from the melting of the subducted plate will eventually resurface to produce chain of volcanic islands on the ocean floor called ISLAND ARCS • As magma accumulates over time, the volc ...
Strand: Interrelationships in Earth/Space Systems
... 12. The ocean’s salinity (saltiness) varies, depending on: (choose all correct items) a. runoff from nearby land b. the amount of evaporation c. the amount of salt used on food by local people. 13. True of False: Marine organisms are dependent on the dissolved gases in the ocean for survival. ...
... 12. The ocean’s salinity (saltiness) varies, depending on: (choose all correct items) a. runoff from nearby land b. the amount of evaporation c. the amount of salt used on food by local people. 13. True of False: Marine organisms are dependent on the dissolved gases in the ocean for survival. ...
Module 4 Processes That Shape the Earth Extended
... boundaries. The source of hot-spot magmas is believed to be well below the lithosphere, probably at the core-mantle boundary. Hot-spot volcanoes often form long chains that result from the relative motion of the lithosphere plate over the hot-spot source. The size of the Earth has not changed signif ...
... boundaries. The source of hot-spot magmas is believed to be well below the lithosphere, probably at the core-mantle boundary. Hot-spot volcanoes often form long chains that result from the relative motion of the lithosphere plate over the hot-spot source. The size of the Earth has not changed signif ...
Processes That Shape the Earth
... boundaries. The source of hot-spot magmas is believed to be well below the lithosphere, probably at the core-mantle boundary. Hot-spot volcanoes often form long chains that result from the relative motion of the lithosphere plate over the hot-spot source. ...
... boundaries. The source of hot-spot magmas is believed to be well below the lithosphere, probably at the core-mantle boundary. Hot-spot volcanoes often form long chains that result from the relative motion of the lithosphere plate over the hot-spot source. ...
Appendix: Glossary and References
... bottom current in the Atlantic Ocean formed by thermohaline (density-driven) circulation North Atlantic Gyre–a large circular surface current that rotates clockwise in the Atlantic Ocean in the Northern Hemisphere; includes the Gulf Stream nourishment/renourishment–a manmade attempt to redirect or r ...
... bottom current in the Atlantic Ocean formed by thermohaline (density-driven) circulation North Atlantic Gyre–a large circular surface current that rotates clockwise in the Atlantic Ocean in the Northern Hemisphere; includes the Gulf Stream nourishment/renourishment–a manmade attempt to redirect or r ...
The Lithosphere - Westmount High School
... Alfred Wegener developed the idea of continental drift. Continental drift: The continental drift theory is the theory that once all the continents were joined in a super-continent, which scientists call Pangaea. ...
... Alfred Wegener developed the idea of continental drift. Continental drift: The continental drift theory is the theory that once all the continents were joined in a super-continent, which scientists call Pangaea. ...
Climate Change and the Occurrence of Harmful
... and pathogenic microorganisms, it could threaten fish, marine life, shellfish, and human health. A worst-case scenario is one where in the future, swimming at our beaches becomes more regularly associated with respiratory irritation; our coastal waters and shorelines often are covered with a scum of ...
... and pathogenic microorganisms, it could threaten fish, marine life, shellfish, and human health. A worst-case scenario is one where in the future, swimming at our beaches becomes more regularly associated with respiratory irritation; our coastal waters and shorelines often are covered with a scum of ...
Structure of the Earth
... concept of isostacy… – Continental lithosphere sinks deeper and rides higher than oceanic lithosphere due to it s thickness and lower density. – In this picture the thick board represents the continental lithosphere. – The thinner boards represent the oceanic lithosphere. – Note, if you remo ...
... concept of isostacy… – Continental lithosphere sinks deeper and rides higher than oceanic lithosphere due to it s thickness and lower density. – In this picture the thick board represents the continental lithosphere. – The thinner boards represent the oceanic lithosphere. – Note, if you remo ...
On the depth of oceanic earthquakes - Archimer
... Hence, we reexamined the age of the seven earthquakes that lay below the 600°C isotherm after the effect of temperature dependent conductivity was used to compute the depth of the isotherms (Table 1). Two of the seven (events 1 and 2 in Table 1) are located close to the crest of the equatorial East ...
... Hence, we reexamined the age of the seven earthquakes that lay below the 600°C isotherm after the effect of temperature dependent conductivity was used to compute the depth of the isotherms (Table 1). Two of the seven (events 1 and 2 in Table 1) are located close to the crest of the equatorial East ...
Earthquakes are concentrated along oceanic ridges, transform faults
... deep-sea trench and away from the island arc. ...
... deep-sea trench and away from the island arc. ...
Slide 1
... surface was at the base of the lithosphere, not at the base of the crust. – Hess and Dietz succeeded where Wegener had failed. Continents are no longer thought to plow through oceanic crust but are considered to be part of plates that move on the soft, plastic asthenosphere. A driving force, convect ...
... surface was at the base of the lithosphere, not at the base of the crust. – Hess and Dietz succeeded where Wegener had failed. Continents are no longer thought to plow through oceanic crust but are considered to be part of plates that move on the soft, plastic asthenosphere. A driving force, convect ...
Cracks of the World - 11 - Gênese do petróleo
... state and a country-wide, west-northwest fracture system that offsets the inferred Cambrian craton edge some 3500 km westward from its position within the Chortis block of Central America. Furthermore, this fracture system integrates with oceanic fracture systems in both the Pacific and central Atla ...
... state and a country-wide, west-northwest fracture system that offsets the inferred Cambrian craton edge some 3500 km westward from its position within the Chortis block of Central America. Furthermore, this fracture system integrates with oceanic fracture systems in both the Pacific and central Atla ...
Chapter 3: Feedbacks in the Carbon Cycle
... • The downward movement of surface waters, which have been in contact with the atmosphere and thus are enriched with excess CO2, would be reduced, thereby reducing the oceans’ capacity to take up excess CO2. • Any decrease in the amount of water moving upward within the ocean would affect the biolog ...
... • The downward movement of surface waters, which have been in contact with the atmosphere and thus are enriched with excess CO2, would be reduced, thereby reducing the oceans’ capacity to take up excess CO2. • Any decrease in the amount of water moving upward within the ocean would affect the biolog ...
Summary of the Glenn Creek Quadrangle
... Cambrian times through the Creataceous with an unconformity between Cambrian and carboniferous sedimentary deposits. This is the result of erosional forces stemming from the land's past existence as a plain before the Rocky Mountains formed. Some Permian and Triassic sediments are also unpreserved. ...
... Cambrian times through the Creataceous with an unconformity between Cambrian and carboniferous sedimentary deposits. This is the result of erosional forces stemming from the land's past existence as a plain before the Rocky Mountains formed. Some Permian and Triassic sediments are also unpreserved. ...
Ocean basin features
... by a single shade of blue. You will load a new legend that classifies depth using different colors. (To speed things up, you will not turn the themes on until after you have loaded all of the legends.) Click the QuickLoad button , select the Atlantic Bathymetry legend, and click OK. Repeat this proc ...
... by a single shade of blue. You will load a new legend that classifies depth using different colors. (To speed things up, you will not turn the themes on until after you have loaded all of the legends.) Click the QuickLoad button , select the Atlantic Bathymetry legend, and click OK. Repeat this proc ...
Ch 5 Notes
... 3. Also occur on land a. Two of Earth’s plates slid apart and a deep valley, called a rift valley, forms i. Ex: Great Rift Valley in East Africa ii. Convergent Boundaries 1. The place where two plates come together, or converge 2. The result is called a collision a. The density of the plates determi ...
... 3. Also occur on land a. Two of Earth’s plates slid apart and a deep valley, called a rift valley, forms i. Ex: Great Rift Valley in East Africa ii. Convergent Boundaries 1. The place where two plates come together, or converge 2. The result is called a collision a. The density of the plates determi ...
Anoxic event
Oceanic anoxic events or anoxic events (Anoxia conditions) refer to intervals in the Earth's past where portions of oceans become depleted in oxygen (O2) at depths over a large geographic area. During some of these events, euxinia develops - euxinia refers to anoxic waters that contain H2S hydrogen sulfide. Although anoxic events have not happened for millions of years, the geological record shows that they happened many times in the past. Anoxic events coincide with several mass extinctions and may contribute to these events. These mass extinctions include some that geobiologists use as time markers in biostratigraphic dating. It is believed oceanic anoxic events are strongly linked to slowing of ocean circulation, climatic warming and elevated levels of greenhouse gases. Enhanced volcanism (through the release of CO2 and other greenhouse gases) is the proposed central external trigger for the development of these events.