Old` Rocks Where They Shouldn`t be
... colleagues circumvent this obviously embarrassing problem? Since the 'dating' ...
... colleagues circumvent this obviously embarrassing problem? Since the 'dating' ...
- cK-12
... 4) The sediments that top the oceanic crust are primarily a) Sands blown from the land. b) Fossils of fish and marine mammals. c) Mud and tiny marine fossils. d) There are no sediments on the oceanic crust. ...
... 4) The sediments that top the oceanic crust are primarily a) Sands blown from the land. b) Fossils of fish and marine mammals. c) Mud and tiny marine fossils. d) There are no sediments on the oceanic crust. ...
Plate Tectonics
... seafloor away from the ridge. 3. As the seafloor spreads apart, magma moves up and flows from the cracks, cools, and forms new seafloor. ...
... seafloor away from the ridge. 3. As the seafloor spreads apart, magma moves up and flows from the cracks, cools, and forms new seafloor. ...
Theory of Plate Tectonics II
... boundaries evolving over time, because the time scale is too great, but: ...
... boundaries evolving over time, because the time scale is too great, but: ...
Understanding Plate Motions - Maria Montessori Academy Blog
... Himalayas and the Tibetan Plateau. Below: Cartoon cross sections showing the meeting of these two plates before and after their collision. The reference points (small squares) show the amount of uplift of an imaginary point in the Earth's crust during this mountain-building process. ...
... Himalayas and the Tibetan Plateau. Below: Cartoon cross sections showing the meeting of these two plates before and after their collision. The reference points (small squares) show the amount of uplift of an imaginary point in the Earth's crust during this mountain-building process. ...
Seafloor Spreading and Plate Tectonics
... Seafloor Spreading: II Formally proposed by Dietz (1961) and Hess (1962): • Convection cells: Mantle upwells under mid-ocean ridge (MOR). • Lithosphere with new oceanic crust is formed at MOR, then spreads laterally as if on conveyor belt. • Lithospheric plate with oceanic crust is dragged down at ...
... Seafloor Spreading: II Formally proposed by Dietz (1961) and Hess (1962): • Convection cells: Mantle upwells under mid-ocean ridge (MOR). • Lithosphere with new oceanic crust is formed at MOR, then spreads laterally as if on conveyor belt. • Lithospheric plate with oceanic crust is dragged down at ...
Review Test 2 - Course World
... world, a type of sulfur-loving bacteria was the worms' food source. Clouds of bacteria, appearing white in the lights of the sub, were able to use hydrogen sulfide as an energy source. In most other food chains, plants convert carbon dioxide into food using ________ during photosynthesis. These pecu ...
... world, a type of sulfur-loving bacteria was the worms' food source. Clouds of bacteria, appearing white in the lights of the sub, were able to use hydrogen sulfide as an energy source. In most other food chains, plants convert carbon dioxide into food using ________ during photosynthesis. These pecu ...
Year 3 Plate Tectonics
... Understanding hotspots Some volcanoes do not occur on plate boundaries. These volcanoes are formed over hotspots. These are fixed points in the mantle that generate intense heat. Small, long lasting, exceptionally hot areas of magma exist under the Earth's surface which in turn sustains longlasting ...
... Understanding hotspots Some volcanoes do not occur on plate boundaries. These volcanoes are formed over hotspots. These are fixed points in the mantle that generate intense heat. Small, long lasting, exceptionally hot areas of magma exist under the Earth's surface which in turn sustains longlasting ...
Eighth Grade ScienceEarth`s HistoryStudy Guide
... 6. What is subduction? When one plate goes under another plate and it is melted back into the mantle. 7. The Earth’s plates are made of what layer(s)? inner core, outer core, mantle (asthenosphere—upper mantle), crust (lithosphere) 8. Explain convection currents. Fluids when heated become less dense ...
... 6. What is subduction? When one plate goes under another plate and it is melted back into the mantle. 7. The Earth’s plates are made of what layer(s)? inner core, outer core, mantle (asthenosphere—upper mantle), crust (lithosphere) 8. Explain convection currents. Fluids when heated become less dense ...
Chapter 4 Assignment GEarthOL
... a) Deeper regions of the ocean floor tend to be younger. b) The Pacific is larger than the Atlantic because it contains older oceanic floor. c) The oldest oceanic crust is present only near trenches. d) The youngest oceanic crust is near the ridges. ...
... a) Deeper regions of the ocean floor tend to be younger. b) The Pacific is larger than the Atlantic because it contains older oceanic floor. c) The oldest oceanic crust is present only near trenches. d) The youngest oceanic crust is near the ridges. ...
Study guide: exam #1
... o Avoid information about specific earthquakes o Understand the significance of shallow, intermediate, and deep focus earthquakes in regard to plate tectonic ideas o Questions: 1-11 ...
... o Avoid information about specific earthquakes o Understand the significance of shallow, intermediate, and deep focus earthquakes in regard to plate tectonic ideas o Questions: 1-11 ...
Seafloor Spreading Lab with Makeup
... Background: In the last few decades, scientists have discovered both age and magnetic patterns in the seafloor, which are evidence for plate tectonics. These patterns show that new seafloor has been forming for millions of years at mid-ocean ridges throughout the oceans. Magma melted within the crus ...
... Background: In the last few decades, scientists have discovered both age and magnetic patterns in the seafloor, which are evidence for plate tectonics. These patterns show that new seafloor has been forming for millions of years at mid-ocean ridges throughout the oceans. Magma melted within the crus ...
Earth Crust in Motion Vocbaulary (Aca).doc
... Transform Boundary – a plate boundary where two plates move past each other in opposite directions Continental Drift – the hypothesis that all continents were once joined together in a single landmass and have since drifted to their current locations Fault – breaks in Earth’s crust where rocks have ...
... Transform Boundary – a plate boundary where two plates move past each other in opposite directions Continental Drift – the hypothesis that all continents were once joined together in a single landmass and have since drifted to their current locations Fault – breaks in Earth’s crust where rocks have ...
volcanic islands
... Abyssal Plain -Very flat area of the ocean floor at the edge of the continental rise. •Average depth is about 4-6 km (2.5-4 mi). •Covered by a layer of sediment, mostly <1 km thick. •The flattest areas on the planet. ...
... Abyssal Plain -Very flat area of the ocean floor at the edge of the continental rise. •Average depth is about 4-6 km (2.5-4 mi). •Covered by a layer of sediment, mostly <1 km thick. •The flattest areas on the planet. ...
Marine Geology
... floors were dull expanses of mudfeatureless and flat. For centuries , naturalists also thought that the oldest rocks on Earth were on the ocean floors . They believed that the present-day ocean basins formed at the very beginning of the Earth 's history and throughout time they had slowly been filli ...
... floors were dull expanses of mudfeatureless and flat. For centuries , naturalists also thought that the oldest rocks on Earth were on the ocean floors . They believed that the present-day ocean basins formed at the very beginning of the Earth 's history and throughout time they had slowly been filli ...
Interactive Plate Tectonics - Fredericksburg City Schools
... At convergent boundaries, tectonic _____________ ____________with each other. The events that occur at these boundaries are linked to the types of plates — oceanic or continental — that are interacting. Subduction Zones and Volcanoes At some convergent boundaries, an oceanic plate collides with a co ...
... At convergent boundaries, tectonic _____________ ____________with each other. The events that occur at these boundaries are linked to the types of plates — oceanic or continental — that are interacting. Subduction Zones and Volcanoes At some convergent boundaries, an oceanic plate collides with a co ...
Quiz 4 material 104
... and melts at the oceanic ridges and creates new seafloor that moves like a conveyor belt symmetrically away from the ridge and as the seafloor becomes older, colder and denser it eventually sinks back into the Earth's interior at subduction zones where the oceanic crust is recycled (this model of pl ...
... and melts at the oceanic ridges and creates new seafloor that moves like a conveyor belt symmetrically away from the ridge and as the seafloor becomes older, colder and denser it eventually sinks back into the Earth's interior at subduction zones where the oceanic crust is recycled (this model of pl ...
Introduction - Shetland Amenity Trust
... million years ago the Iapetus Ocean closed and these rocks were caught between two colliding continents. The ocean crust was thrust, bent up steeply and left sitting on top of continental crust. You will see this continental crust in the west of the islands and explore the stranded ocean crust in th ...
... million years ago the Iapetus Ocean closed and these rocks were caught between two colliding continents. The ocean crust was thrust, bent up steeply and left sitting on top of continental crust. You will see this continental crust in the west of the islands and explore the stranded ocean crust in th ...
Plate Tectonics Constructive Plate Margins
... Constructive Plate Margins Constructive plate margins, this is where there are two plates moving away from each other causing new oceanic crust to be formed and mid-ocean ridges are created by the build up of molten rock on the sea floor due to the mantle building up. This new crust pushes the old c ...
... Constructive Plate Margins Constructive plate margins, this is where there are two plates moving away from each other causing new oceanic crust to be formed and mid-ocean ridges are created by the build up of molten rock on the sea floor due to the mantle building up. This new crust pushes the old c ...
Answer Key for Effects of Plate Tectonics Note-taking
... earthquakes and volcanoes occur most frequently at mid-ocean ridges and specific areas around the world, led to the development of a new unifying theory called the plate tectonic theory. The plate tectonic theory explains how earth works. Heat from Earth’s interior, creates convection currents which ...
... earthquakes and volcanoes occur most frequently at mid-ocean ridges and specific areas around the world, led to the development of a new unifying theory called the plate tectonic theory. The plate tectonic theory explains how earth works. Heat from Earth’s interior, creates convection currents which ...
As the continental shelf gets steeper the water depth
... Slide seven – Mid-Oceanic Ridge The mid-oceanic ridge is like an underwater mountain range. The mountains can reach a height of up to 3000m and the can be around 2000m wide. There are deep trenched that are located in the center of the mid-oceanic ridge; it divides the mountain ranges right down t ...
... Slide seven – Mid-Oceanic Ridge The mid-oceanic ridge is like an underwater mountain range. The mountains can reach a height of up to 3000m and the can be around 2000m wide. There are deep trenched that are located in the center of the mid-oceanic ridge; it divides the mountain ranges right down t ...
PLATE TECTONICS The Earth`s Crust is in Motion
... As the rift valley expands two continental plates have been constructed from the original one. The molten rock continues to push the crust apart creating new crust as it does. ...
... As the rift valley expands two continental plates have been constructed from the original one. The molten rock continues to push the crust apart creating new crust as it does. ...
Quiz 2 - Study Guidelines Study Outline
... Know what is meant by first order physiographic features and understand the distribution of these features over the Earth’s surface. Know the importance of the hypsographic curve, including details related to land elevation and ocean depth. Know the second order features of the marine environment. U ...
... Know what is meant by first order physiographic features and understand the distribution of these features over the Earth’s surface. Know the importance of the hypsographic curve, including details related to land elevation and ocean depth. Know the second order features of the marine environment. U ...
1 MAY 2011 Oceanogra phy Ch 2 Plate Tectonics and the Ocean
... (Spreading Centers) and very deep narrow trenches at the edge of the basins (Subduction zones). Vine and Matthews combined magnetic stripes and Sea floor spreading. P.46 Other Evidence from the Ocean floor. Age. Oldest crust 0.18 BY, is being subducted into the mantle at the trenches and created a ...
... (Spreading Centers) and very deep narrow trenches at the edge of the basins (Subduction zones). Vine and Matthews combined magnetic stripes and Sea floor spreading. P.46 Other Evidence from the Ocean floor. Age. Oldest crust 0.18 BY, is being subducted into the mantle at the trenches and created a ...
Abyssal plain
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3000 and 6000 m. Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth’s surface. They are among the flattest, smoothest and least explored regions on Earth. Abyssal plains are key geologic elements of oceanic basins (the other elements being an elevated mid-ocean ridge and flanking abyssal hills). In addition to these elements, active oceanic basins (those that are associated with a moving plate tectonic boundary) also typically include an oceanic trench and a subduction zone.Abyssal plains were not recognized as distinct physiographic features of the sea floor until the late 1940s and, until very recently, none had been studied on a systematic basis. They are poorly preserved in the sedimentary record, because they tend to be consumed by the subduction process. The creation of the abyssal plain is the end result of spreading of the seafloor (plate tectonics) and melting of the lower oceanic crust. Magma rises from above the asthenosphere (a layer of the upper mantle) and as this basaltic material reaches the surface at mid-ocean ridges it forms new oceanic crust. This is constantly pulled sideways by spreading of the seafloor. Abyssal plains result from the blanketing of an originally uneven surface of oceanic crust by fine-grained sediments, mainly clay and silt. Much of this sediment is deposited by turbidity currents that have been channelled from the continental margins along submarine canyons down into deeper water. The remainder of the sediment is composed chiefly of pelagic sediments. Metallic nodules are common in some areas of the plains, with varying concentrations of metals, including manganese, iron, nickel, cobalt, and copper. These nodules may provide a significant resource for future mining ventures.Owing in part to their vast size, abyssal plains are currently believed to be a major reservoir of biodiversity. The abyss also exerts significant influence upon ocean carbon cycling, dissolution of calcium carbonate, and atmospheric CO2 concentrations over timescales of 100–1000 years. The structure and function of abyssal ecosystems are strongly influenced by the rate of flux of food to the seafloor and the composition of the material that settles. Factors such as climate change, fishing practices, and ocean fertilization are expected to have a substantial effect on patterns of primary production in the euphotic zone. This will undoubtedly impact the flux of organic material to the abyss in a similar manner and thus have a profound effect on the structure, function and diversity of abyssal ecosystems.