We learned that the average age of oceanic crust is 55 million years
... between two continental plates. The location where the sinking of a plate occurs is called a subduction zone. The trenches in the deepest parts of the ocean floor are created by subduction. This is a result of oceanic-continental convergence. Also, volcanic activity occurs as a result of oceanic con ...
... between two continental plates. The location where the sinking of a plate occurs is called a subduction zone. The trenches in the deepest parts of the ocean floor are created by subduction. This is a result of oceanic-continental convergence. Also, volcanic activity occurs as a result of oceanic con ...
Divergent Plate Boundaries (plates move )
... descends, it triggers _________ due to the release of the salt _________ it contains. The _______ rises creating a chain of __________ called a continental _________ _____. An example is the ___________ mountains and Mt. St.____________ which produce __________ eruptions. 2. Oceanic- Oceanic: one __ ...
... descends, it triggers _________ due to the release of the salt _________ it contains. The _______ rises creating a chain of __________ called a continental _________ _____. An example is the ___________ mountains and Mt. St.____________ which produce __________ eruptions. 2. Oceanic- Oceanic: one __ ...
The Solid Earth
... Thickness of sediment increases with distance from the mid-ocean ridge Age of sediment is approximately the same as the crust on which it lies You nge r ...
... Thickness of sediment increases with distance from the mid-ocean ridge Age of sediment is approximately the same as the crust on which it lies You nge r ...
7 Grade: Ch. 10 STUDY GUIDE KEY
... All the continents were once joined in a single landmass that has since drifted apart. 12. What occurs where the oceanic crust bends down toward the mantle at a deep-ocean trench? Subduction 13. These are contained in the lithosphere which float above the asthenosphere? Plates 14. An ocean will ____ ...
... All the continents were once joined in a single landmass that has since drifted apart. 12. What occurs where the oceanic crust bends down toward the mantle at a deep-ocean trench? Subduction 13. These are contained in the lithosphere which float above the asthenosphere? Plates 14. An ocean will ____ ...
Sea-Floor Spreading - Catawba County Schools
... deep underwater canyons are deep-ocean trenches. Subduction is the process by which the ocean floor sinks beneath a deepocean trench and back into the mantle. ...
... deep underwater canyons are deep-ocean trenches. Subduction is the process by which the ocean floor sinks beneath a deepocean trench and back into the mantle. ...
A Head
... happen near the oceanic trenches. 11 The Himalaya mountains are growing taller by about 5 mm each year. 12 Surveys of the ocean floor show tat there are very long mountain ridges beneath the oceans. 13 Rock samples have been taken from the ocean floor. These show that the rocks are much younger near ...
... happen near the oceanic trenches. 11 The Himalaya mountains are growing taller by about 5 mm each year. 12 Surveys of the ocean floor show tat there are very long mountain ridges beneath the oceans. 13 Rock samples have been taken from the ocean floor. These show that the rocks are much younger near ...
The Floors of the Oceans
... development of a divergent plate boundary and new oceanic crust Atlantic is a mature ocean with passive edges ...
... development of a divergent plate boundary and new oceanic crust Atlantic is a mature ocean with passive edges ...
Marine Life Zones Why the Ocean? Regions that contain
... barnacles, and flat fish like flounder ...
... barnacles, and flat fish like flounder ...
Sea Floor Spreading NOTES 2016 Key
... 1. Magnetic ___Reversals_____: Throughout Earth’s history, the north and south magnetic poles have changed places many times. When the poles change places, the ___polarity__ of Earth’s magnetic poles changes ...
... 1. Magnetic ___Reversals_____: Throughout Earth’s history, the north and south magnetic poles have changed places many times. When the poles change places, the ___polarity__ of Earth’s magnetic poles changes ...
Sea-Floor Spreading
... the sea floor adjacent to a continental margin. For example, ocean crust formed at the East Pacific Rise, an oceanic ridge in the east Pacific, plunges into the trench adjacent to the Andes Mountains on the west side of the South American continent. In Hess' model, convection currents push the ocean ...
... the sea floor adjacent to a continental margin. For example, ocean crust formed at the East Pacific Rise, an oceanic ridge in the east Pacific, plunges into the trench adjacent to the Andes Mountains on the west side of the South American continent. In Hess' model, convection currents push the ocean ...
I. Continental Drift a. Alfred Wegener—German meteorologist i
... b. increase in lithosphere thickness because cooling strengthens underlying mantle iii. spreading occurs from 2 to 15 cm/yr: average ~5 cm/yr 1. could have created all ocean basins in existence in 200 million years 2. no oceanic crust has been discovered that is over 180 million years old c. diverge ...
... b. increase in lithosphere thickness because cooling strengthens underlying mantle iii. spreading occurs from 2 to 15 cm/yr: average ~5 cm/yr 1. could have created all ocean basins in existence in 200 million years 2. no oceanic crust has been discovered that is over 180 million years old c. diverge ...
Sea Floor Structures
... glaciers cut deep canyons into the exposed land. Once sea level rose, these canyons were submerged and gave rise to much larger submarine canyons. The continental shelf typically extends outward varying distances (from 1/2 mile to 470 miles) at a gentle slope. At the end of this gentle slope, the sh ...
... glaciers cut deep canyons into the exposed land. Once sea level rose, these canyons were submerged and gave rise to much larger submarine canyons. The continental shelf typically extends outward varying distances (from 1/2 mile to 470 miles) at a gentle slope. At the end of this gentle slope, the sh ...
Seafloor Spreading
... toward the surface at mid ocean ridges – As the material approaches the surface it moves sideways, pulling the ocean floor apart at the center of the mid ocean ridge – Magma erupts from the resulting cracks and cools to form new ocean crust – Through time the new ocean crust moves away from the cent ...
... toward the surface at mid ocean ridges – As the material approaches the surface it moves sideways, pulling the ocean floor apart at the center of the mid ocean ridge – Magma erupts from the resulting cracks and cools to form new ocean crust – Through time the new ocean crust moves away from the cent ...
Ocean Depth through Deep Time
... The Earth’s oceans have played an important role in the evolution of life and tectonics on Earth, and yet our understanding of basic connections between these remains limited. One of the central, and still unanswered questions, is whether Earth’s oceans have been present over all of Earth’s history, ...
... The Earth’s oceans have played an important role in the evolution of life and tectonics on Earth, and yet our understanding of basic connections between these remains limited. One of the central, and still unanswered questions, is whether Earth’s oceans have been present over all of Earth’s history, ...
mantle
... Mid ocean ridge—the fracture zone along the ocean bottom where molten mantle material comes to the surface, thus creating new crust. This fracture can be seen beneath the ocean as a line of ridges that form as molten rock reaches the ocean bottom and solidifies. Plate Tectonics—the theory supported ...
... Mid ocean ridge—the fracture zone along the ocean bottom where molten mantle material comes to the surface, thus creating new crust. This fracture can be seen beneath the ocean as a line of ridges that form as molten rock reaches the ocean bottom and solidifies. Plate Tectonics—the theory supported ...
E.S. Ch. 3 Study Guide
... The size of the Earth’s oceans is determined by how fast new crust is being created at midocean ridges and how fast old crust is being swallowed up at deep sea trenches. The Atlantic Ocean is expanding. Plate- A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of ...
... The size of the Earth’s oceans is determined by how fast new crust is being created at midocean ridges and how fast old crust is being swallowed up at deep sea trenches. The Atlantic Ocean is expanding. Plate- A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of ...
Chapter 04 Plate Tectonics
... 270 million years ago all of Earth’s continents formed one large continent called Pangaea. ...
... 270 million years ago all of Earth’s continents formed one large continent called Pangaea. ...
SCI Ch4 Study Guide KEY
... 4. The same types of rocks, rock structures, and fossils have been found to exist on many different continents. What theory does this support? Continental drift 5. What is glossopteris? A fossil plant that helps support the theory of continental drift 6. Why does sea floor spreading occur? Molten ma ...
... 4. The same types of rocks, rock structures, and fossils have been found to exist on many different continents. What theory does this support? Continental drift 5. What is glossopteris? A fossil plant that helps support the theory of continental drift 6. Why does sea floor spreading occur? Molten ma ...
PT Magic Squares - Welcome to Rossignols.net
... Directions: Above is a group of terms related to Plate Tectonics. Your task is to match the definitions below with the correct term. Place the number of the definition in the box with the term. Check your answers by adding the numbers to see if the sums of each column and each row add up to the same ...
... Directions: Above is a group of terms related to Plate Tectonics. Your task is to match the definitions below with the correct term. Place the number of the definition in the box with the term. Check your answers by adding the numbers to see if the sums of each column and each row add up to the same ...
Oceanography - saddlespace.org
... Composed of Sediments Up to 1 Km thick Sediments came from continents Abyssal Hills Small rolling hills near continental margins. 1-10 km across A few 100 meters high ...
... Composed of Sediments Up to 1 Km thick Sediments came from continents Abyssal Hills Small rolling hills near continental margins. 1-10 km across A few 100 meters high ...
Ch 2 test
... 17. Which one of the following concerning mid-ocean ridges is false? a. They are sites for submarine eruptions of basaltic lava. b. They are where young lithosphere is added to the edges of spreading, oceanic plates. c. They have thick coatings of old sediment. d. Sediments include thick siliceous ...
... 17. Which one of the following concerning mid-ocean ridges is false? a. They are sites for submarine eruptions of basaltic lava. b. They are where young lithosphere is added to the edges of spreading, oceanic plates. c. They have thick coatings of old sediment. d. Sediments include thick siliceous ...
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.