Key - University of California San Diego
... 25) What is NOT characteristic of a low-pressure system: a) rising air b) convergence high up in the atmosphere c) clouds d)convergence near the surface 26) Average seawater contains: a) 3.5% salt b) 35% salt c) 1% salt d) 60% salt 27) Which is NOT characteristic of an El Nino event: a)Warmer than u ...
... 25) What is NOT characteristic of a low-pressure system: a) rising air b) convergence high up in the atmosphere c) clouds d)convergence near the surface 26) Average seawater contains: a) 3.5% salt b) 35% salt c) 1% salt d) 60% salt 27) Which is NOT characteristic of an El Nino event: a)Warmer than u ...
NOAA Mid Oceanic Ridges
... 11. Along the rift valley, divergence leads to volcanism that creates new oceanic crust, crust that is in its turn _______ and _____________ by continued divergence and volcanism. 12. By this perpetual process, oceans -_____ and _______slowly but surely. An example occurs at the Juan de Fuca Ridge, ...
... 11. Along the rift valley, divergence leads to volcanism that creates new oceanic crust, crust that is in its turn _______ and _____________ by continued divergence and volcanism. 12. By this perpetual process, oceans -_____ and _______slowly but surely. An example occurs at the Juan de Fuca Ridge, ...
Sonar and the beginning of seafloor spreading
... churning motion of Earths mantle. Convection currents carry heat from the lover mantle and core to the lithosphere. Convection currents also “recycle” lithospheric materials back to the mantle. ...
... churning motion of Earths mantle. Convection currents carry heat from the lover mantle and core to the lithosphere. Convection currents also “recycle” lithospheric materials back to the mantle. ...
Lecture 7. Marine Sediments
... dissolution in corrosive deep waters In today’s ocean this depth (CCD) varies between 3 km (polar) and 5 km (tropical) Thus, accumulation rates vary a lot! ...
... dissolution in corrosive deep waters In today’s ocean this depth (CCD) varies between 3 km (polar) and 5 km (tropical) Thus, accumulation rates vary a lot! ...
9-4 Sea Floor Spreading
... the crust is being pushed together. (Convergent boundaries) The ocean floor is renewed in this process about every 200 million years Most subduction zones (deep ocean trenches) are found n the pacific ...
... the crust is being pushed together. (Convergent boundaries) The ocean floor is renewed in this process about every 200 million years Most subduction zones (deep ocean trenches) are found n the pacific ...
Power Point 9.5
... • A geological theory stating that pieces of Earth’s lithosphere are in constant, slow motion. • As plates move they crash together, pull apart and grind past each other. Each movement along a plate boundary creates a different land feature. ...
... • A geological theory stating that pieces of Earth’s lithosphere are in constant, slow motion. • As plates move they crash together, pull apart and grind past each other. Each movement along a plate boundary creates a different land feature. ...
Plate Tectonics
... hotter rock rises then cools becoming more dense cooled rock sinks toward center again as it approaches the core, it heats again ...
... hotter rock rises then cools becoming more dense cooled rock sinks toward center again as it approaches the core, it heats again ...
Ch 9 3 Actions at Plate Boundaries
... Oceanic Ridge – along well-developed divergent plate boundaries, area where seafloor is elevated The system of ridges is the longest physical feature on Earth’s surface (70,000 km long) These features are 1000 to 4000 km wide, not narrow at all Rift Valley – Deep faulted structures found along the r ...
... Oceanic Ridge – along well-developed divergent plate boundaries, area where seafloor is elevated The system of ridges is the longest physical feature on Earth’s surface (70,000 km long) These features are 1000 to 4000 km wide, not narrow at all Rift Valley – Deep faulted structures found along the r ...
For the Student
... It seems that the more we know about the earth, the more questions we have. It is difficult to visualize a three dimensional earth on two-dimensional paper. In this activity, you will construct a three dimensional model of part of the earth’s surface. Recall that scientists now think that the earth’ ...
... It seems that the more we know about the earth, the more questions we have. It is difficult to visualize a three dimensional earth on two-dimensional paper. In this activity, you will construct a three dimensional model of part of the earth’s surface. Recall that scientists now think that the earth’ ...
PLATE TECTONICS REVIEW (part 2) PLATE BOUNDARIES
... A TRENCH IS FORMING. IT FORMS AS OCEANIC CRUST GOES BENEATH THE CONTINENTAL CRUST. (SUBDUCTION) 3. What is happening at Z? ...
... A TRENCH IS FORMING. IT FORMS AS OCEANIC CRUST GOES BENEATH THE CONTINENTAL CRUST. (SUBDUCTION) 3. What is happening at Z? ...
Plate Tectonic Mapping Assignment
... Using the world map complete the following tasks. If you don’t have the specific colours indicate on the legend what each colour represents. ...
... Using the world map complete the following tasks. If you don’t have the specific colours indicate on the legend what each colour represents. ...
Chapter 4 Marine Sedimentation
... Near the edge of the continents most ocean sediments are sands, mud and gravels from the continent. The composition depends on latitude and climate: calcite in the tropics, sands in the midlatitudes and glacial deposits in the high latitudes. Out in the middle of the ocean, Sedimentation rates are v ...
... Near the edge of the continents most ocean sediments are sands, mud and gravels from the continent. The composition depends on latitude and climate: calcite in the tropics, sands in the midlatitudes and glacial deposits in the high latitudes. Out in the middle of the ocean, Sedimentation rates are v ...
Earth`s Magnetic Field
... __________ 2. Most geologists believe that continents are larger now than they were in the past. __________ 3. The size of the earth is gradually increasing over time because of seafloor spreading. __________ 4. Tectonic plates drift in oceans of melted magma just below the surface of the earth. ___ ...
... __________ 2. Most geologists believe that continents are larger now than they were in the past. __________ 3. The size of the earth is gradually increasing over time because of seafloor spreading. __________ 4. Tectonic plates drift in oceans of melted magma just below the surface of the earth. ___ ...
The Sea Floor
... • Flat, coastal plains with wide continental shelves and gradual slopes, leading to a thick continental rise. ...
... • Flat, coastal plains with wide continental shelves and gradual slopes, leading to a thick continental rise. ...
Exploring the Geosphere and its Processes Name__________________________________
... At the upper right of the simulation lower the zoom toggle. At the lower right check the “both” and “show labels” boxes. ...
... At the upper right of the simulation lower the zoom toggle. At the lower right check the “both” and “show labels” boxes. ...
File
... While thousands of climbers have successfully scaled Mount Everest, the highest point on Earth, only two people have descended to the planet’s deepest point, the Challenger Deep in the Pacific Ocean’s Mariana Trench. Located in the western Pacific east of the Philippines and an average of approximat ...
... While thousands of climbers have successfully scaled Mount Everest, the highest point on Earth, only two people have descended to the planet’s deepest point, the Challenger Deep in the Pacific Ocean’s Mariana Trench. Located in the western Pacific east of the Philippines and an average of approximat ...
Lesson 6 - Earth Formation
... The crust constantly changes due to erosion, deposition, glacial action and plate tectonics. There are two types of crust. Continental - Granite-like rock rich in silicon, oxygen and aluminum. Oceanic - Igneous, basaltic rock containing greater amounts of heavier elements such as magnesium and i ...
... The crust constantly changes due to erosion, deposition, glacial action and plate tectonics. There are two types of crust. Continental - Granite-like rock rich in silicon, oxygen and aluminum. Oceanic - Igneous, basaltic rock containing greater amounts of heavier elements such as magnesium and i ...
IM_chapter9 Seafloor
... Misconception: The ocean floor is flat and featureless, except where islands protrude above the surface. Fact: The ocean floor has far more varied topography than the land areas, with higher and longer mountain ranges and deeper canyons and trenches. ...
... Misconception: The ocean floor is flat and featureless, except where islands protrude above the surface. Fact: The ocean floor has far more varied topography than the land areas, with higher and longer mountain ranges and deeper canyons and trenches. ...
Plate Tectonic Notes Layer of Earth 1. inner core
... Wegener used the similar rocks and similar fossils found on different continents ! 5. Early studies of the ocean floor helped develop the theory of plate tectonics because the age of oceanic crust increases with distance from the mid-ocean ridge.! 6. Plate movement is caused by convection in the ast ...
... Wegener used the similar rocks and similar fossils found on different continents ! 5. Early studies of the ocean floor helped develop the theory of plate tectonics because the age of oceanic crust increases with distance from the mid-ocean ridge.! 6. Plate movement is caused by convection in the ast ...
Oceans 11 - Course World
... spectacular deep-sea garden of hot springs and towering spires they nicknamed the 'Lost City’. "If this were on land," Duke University geologist Jeff Karson said, "it would be a national park." The scientists spotted the formations on Dec. 4 more than 3,200 feet below the frigid, stormy Atlantic dur ...
... spectacular deep-sea garden of hot springs and towering spires they nicknamed the 'Lost City’. "If this were on land," Duke University geologist Jeff Karson said, "it would be a national park." The scientists spotted the formations on Dec. 4 more than 3,200 feet below the frigid, stormy Atlantic dur ...
File
... In the 1960’s Princeton professor H.H. Hess came up with the concept of convection cells – moving mantle patterns that pushed magma up for form ocean ridges. ...
... In the 1960’s Princeton professor H.H. Hess came up with the concept of convection cells – moving mantle patterns that pushed magma up for form ocean ridges. ...
Theory of Plate Tectonics
... Wegener’s Continental Drift How do we explain Sea-floor spreading and Continental Drift? Plate Tectonics ...
... Wegener’s Continental Drift How do we explain Sea-floor spreading and Continental Drift? Plate Tectonics ...
Plate Tectonics 07ppt
... Plates move towards each other Volcanic activity common Deep, medium and shallow earthquakes Three types; Ocean to ocean Ocean to continent Continent to continent ...
... Plates move towards each other Volcanic activity common Deep, medium and shallow earthquakes Three types; Ocean to ocean Ocean to continent Continent to continent ...
Ecosystems and Communities
... Estuaries: where rivers meet the sea. – Contain a mixture of fresh and salt water – Serve as spawning and nursery grounds for many fish and shellfish species. ...
... Estuaries: where rivers meet the sea. – Contain a mixture of fresh and salt water – Serve as spawning and nursery grounds for many fish and shellfish species. ...
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.