Evaluating the lines of evidence for plate tectonics
... I’ve given you space to do this on the back side of this page. Some issues to think about: 1) What did Wegener observe about the shapes of continental coastlines? Give one example of a pair of continents that were used to support the existence of Pangaea. 2) What is a fossil? What was observed a ...
... I’ve given you space to do this on the back side of this page. Some issues to think about: 1) What did Wegener observe about the shapes of continental coastlines? Give one example of a pair of continents that were used to support the existence of Pangaea. 2) What is a fossil? What was observed a ...
study
... 9 Which of the following is a reason why the ocean floor is said to be relatively new? The rate of sea floor spreading is rapid enough to recycle the ocean floor in a 200 million A year cycle. The ocean floor only appeared about 180 million years ago. B The ocean floor was only discovered relatively ...
... 9 Which of the following is a reason why the ocean floor is said to be relatively new? The rate of sea floor spreading is rapid enough to recycle the ocean floor in a 200 million A year cycle. The ocean floor only appeared about 180 million years ago. B The ocean floor was only discovered relatively ...
chap2 - LaffertysBiologyClass
... • Heavier materials settled deep in the Earth • Lighter components formed a thin crust • Eventually, the Earth’s oceans and atmosphere began to form • Earth’s location relative to the sun allows for water to stay liquid – an essential element to sustain life ...
... • Heavier materials settled deep in the Earth • Lighter components formed a thin crust • Eventually, the Earth’s oceans and atmosphere began to form • Earth’s location relative to the sun allows for water to stay liquid – an essential element to sustain life ...
SEA-FLOOR SPREADING By the early 1960s it was clear that
... The answers came from work being done in the 1950s and 1960s from on the geolog of the sea floor. During this time, precision depths, using echo-sounding to measure the travel time to the bottom of the ocean, allowed the seafloor to be mapped. Prior to this time, it had been known that there were un ...
... The answers came from work being done in the 1950s and 1960s from on the geolog of the sea floor. During this time, precision depths, using echo-sounding to measure the travel time to the bottom of the ocean, allowed the seafloor to be mapped. Prior to this time, it had been known that there were un ...
Oceans in motion vocab - Raleigh Charter High School
... along and deposit them just below the continental slope. These sediments accumulate (gather) to form the large, gentle slope of the continental rise. continental shelf break where the bottom sharply drops off into a steep slope. It usually begins at 430 feet (130 meters) depth and can be up to 20 km ...
... along and deposit them just below the continental slope. These sediments accumulate (gather) to form the large, gentle slope of the continental rise. continental shelf break where the bottom sharply drops off into a steep slope. It usually begins at 430 feet (130 meters) depth and can be up to 20 km ...
Plate Tectonics
... parts of Africa, India, Australia and South America 250 million years ago. How could this happen in places that are so warm today? ...
... parts of Africa, India, Australia and South America 250 million years ago. How could this happen in places that are so warm today? ...
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 ...
Ocean habitats (“biozones”)
... photic zone – depth where light is sufficient for photosynthesis dysphotic zone – depth where illumination is too weak for photosynthesis aphotic zone – receives no light from the surface because it is all absorbed by the water above ...
... photic zone – depth where light is sufficient for photosynthesis dysphotic zone – depth where illumination is too weak for photosynthesis aphotic zone – receives no light from the surface because it is all absorbed by the water above ...
Ch 11 Notes File
... - through the process of convection, the Sun heats the surface of the ocean and some of the heat is transferred to the air above which starts to rise - mass of warm air is called a __________________ - as the thermal gets higher it starts to cool then sink back to the surface where it gets reheated ...
... - through the process of convection, the Sun heats the surface of the ocean and some of the heat is transferred to the air above which starts to rise - mass of warm air is called a __________________ - as the thermal gets higher it starts to cool then sink back to the surface where it gets reheated ...
Subducting basaltic crust as a water transporter into the Earth`s
... 1600°C which corresponds to conditions of the deep upper mantle and the mantle transition zone. In this system, two stable phases were identified whose composition is expressed by (FeH)1-xTixO2, and one of them with α-PbO2 type structure (orthorhombic, Pbcn) is stable in the system basalt + H2O at p ...
... 1600°C which corresponds to conditions of the deep upper mantle and the mantle transition zone. In this system, two stable phases were identified whose composition is expressed by (FeH)1-xTixO2, and one of them with α-PbO2 type structure (orthorhombic, Pbcn) is stable in the system basalt + H2O at p ...
plate tectonics
... Hot rock is less dense than cold rock Density affects ocean depth Age and depth increase away from Ridges Young, hot basalt forms high Mid-Ocean Ridges Old, cold basaltic crust is subducted in trenches ...
... Hot rock is less dense than cold rock Density affects ocean depth Age and depth increase away from Ridges Young, hot basalt forms high Mid-Ocean Ridges Old, cold basaltic crust is subducted in trenches ...
Lab 3 Presentation slides
... Review from Lab 2 Cool, rigid lithospheric plates “float” on hotter, more plastic region of the upper mantle, called asthenosphere ...
... Review from Lab 2 Cool, rigid lithospheric plates “float” on hotter, more plastic region of the upper mantle, called asthenosphere ...
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 ...
File
... 9. In addition to volcanoes, what also occurs frequently in the Pacific Ring of Fire? • earthquakes ...
... 9. In addition to volcanoes, what also occurs frequently in the Pacific Ring of Fire? • earthquakes ...
Earth Structure
... – He theorized that hot spots are small melting areas within the mantel where thermal plumes cause magma columns to push up through the crust (forming volcanoes) •Hot spots can occur at fault lines although most form far from plate boundaries Ex. Yellowstone •Hot spots do not move with tectonic plat ...
... – He theorized that hot spots are small melting areas within the mantel where thermal plumes cause magma columns to push up through the crust (forming volcanoes) •Hot spots can occur at fault lines although most form far from plate boundaries Ex. Yellowstone •Hot spots do not move with tectonic plat ...
“I Can” – Plate Tectonics Objectives – Learning Target Analysis
... generated - section 6.1 (also know how these items relate to the causes of convergent and divergent plate boundaries) E 3.2C Describe the differences between oceanic and continental crust (including density, thickness, age, composition – what it’s made of) – sec 6.1-6.4. E3.3A Explain how plate tect ...
... generated - section 6.1 (also know how these items relate to the causes of convergent and divergent plate boundaries) E 3.2C Describe the differences between oceanic and continental crust (including density, thickness, age, composition – what it’s made of) – sec 6.1-6.4. E3.3A Explain how plate tect ...
the lesson`s assignment document
... mid-ocean ridge and __________in subduction zones or near the edges of continents far from the ridge. ...
... mid-ocean ridge and __________in subduction zones or near the edges of continents far from the ridge. ...
7 The coastline and the Tasman Sea
... 7. The coastline and the Tasman Sea The most obvious landscape feature in Australia’s Coastal Wilderness is of course the coastline itself. How did it establish itself at its present location? We have seen that, 20,000 years ago, the coastline was about 20 km to the east. But in the midCretaceous, ...
... 7. The coastline and the Tasman Sea The most obvious landscape feature in Australia’s Coastal Wilderness is of course the coastline itself. How did it establish itself at its present location? We have seen that, 20,000 years ago, the coastline was about 20 km to the east. But in the midCretaceous, ...
The theory of Plate Tectonics Plate Boundaries
... Oceanic - Oceanic Divergent Boundary ● Where the two plates divided, hot rock rises from the ...
... Oceanic - Oceanic Divergent Boundary ● Where the two plates divided, hot rock rises from the ...
PowerPoint - Cal State LA - Instructional Web Server
... stripes of normal and reverse polarity at the mid-ocean ridge. ...
... stripes of normal and reverse polarity at the mid-ocean ridge. ...
Name Class Date ______ Chapter 9 Plate Tectonics Study Guide
... Write the letter that best answers the question or completes the statement. 1. Wegener’s continental drift hypothesis stated that all the continents once joined together to form a. two major supercontinents. b. two major supercontinents and three smaller continents. c. one major supercontinent. d. t ...
... Write the letter that best answers the question or completes the statement. 1. Wegener’s continental drift hypothesis stated that all the continents once joined together to form a. two major supercontinents. b. two major supercontinents and three smaller continents. c. one major supercontinent. d. t ...
Plate Tectonics Continental Drift
... • All the plates are moving and changing shape • They move about 5cm a year • Move due to convection in the mantle • Movement causes earthquakes, volcanoes, ...
... • All the plates are moving and changing shape • They move about 5cm a year • Move due to convection in the mantle • Movement causes earthquakes, volcanoes, ...
Answer - Scioly.org
... Passive margins are not situated along active plate boundaries, whereas active margins are. Passive margins are found along the western coasts of most of the Americas, whereas active margins are found along most of the Atlantic coasts. Passive margins are found along most of the Atlantic Ocean coast ...
... Passive margins are not situated along active plate boundaries, whereas active margins are. Passive margins are found along the western coasts of most of the Americas, whereas active margins are found along most of the Atlantic coasts. Passive margins are found along most of the Atlantic Ocean coast ...
tectonic plates
... Similar fossils have been found on continents that once could have been together. ...
... Similar fossils have been found on continents that once could have been together. ...
Convergent Boundaries
... subducts under the Philippine Plate, the Pacific Plate is pulled down to form the Mariana Trench. The leading edge of the overriding Philippine Plate is marked by a chain of volcanic islands, the Mariana Islands. When an oceanic plate converges with a continental plate, the denser oceanic plate subd ...
... subducts under the Philippine Plate, the Pacific Plate is pulled down to form the Mariana Trench. The leading edge of the overriding Philippine Plate is marked by a chain of volcanic islands, the Mariana Islands. When an oceanic plate converges with a continental plate, the denser oceanic plate subd ...
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.