Halfway between the center of the ocean and the continents d. Pdf of the report or purchase a hard copy, please visit the national acad emies press. It is your task to make sure the work is done correctly, on time and to budget. Plate tectonics has been rigorously tested from numerous sub disciplines in geology. Fill in the blanks based on your seafloor spreading model. View test prep seafloor sediments quiz spring 2015 key from ocan 1 at city college of san francisco. Youll see underwater mountains called seamounts, cliffs, trenches, and abysses. Since the development of the theory, geologists have had to reexamine almost every aspect of.
Molten rock pushes up from the asthenosphere and pushes the plates apart at the mid ocean ridge. There is a printable worksheet available for download here so you can take the quiz with pen and paper. Name the feature of the ocean floor that is labeled c. The international bathymetric chart of the arctic ocean. Discover the different fieldwork techniques used by geologists, ecologists and archaeologists to explore the seafloor, and have a go yourself. All these common depth point datasets are combined into single traces through a process called stacking. Seafloor spreading hypothesis new seafloor forms by upwelling at the center of mor and moves laterally earth is not expanding so that must mean that older crust is destroyed in the subduction zones at the trenches seafloor is younger than 200 my solved continental drift problem plate tectonics. Sediments overview this lesson provides an overview of the types of sediments in the ocean including their origin and composition. Points a through d are locations on the ocean floor. Lithospheric plate with oceanic crust is dragged down at trenches. Share what s the deal with debris ocean conservancy.
Why are undersea features mountains, canyons larger and more dramatic and also slower changing than those on land. Seafloor definition of seafloor by the free dictionary. Continental drift, sea floor spreading and plate tectonics. This marks the beginning of where the continent ends and the ocean floor begins. Oceanic crust near the mid ocean ridge is than the crust that is. Name the feature of the ocean floor that is labeled a. Midocean ridges and seafloor spreading can also influence sea levels. As the ocean seafloor spreads, the newly formed floor will adapt a specific magnetic signature according to the earths magnetic pole at that time.
Major ocean relief features four major divisions in the ocean relief are. The diagram on the next page represents a section of the ocean. Common classification methods by size and origin are presented and then students are encouraged to think about how sediments of various types are distributed throughout the ocean. What geographic features make up the continental margin. In this activity, you will observe the pattern and learn to calculate the rate of sea floor spreading. Challenger, was the fi rst ship to carry a scientifi c expedition to map the depths of the ocean. The sediments and rock of the ocean floor contain records of active biological, chemical, and. Mapping the characteristics of the ocean basin has been difficult for several reasons. Indeed, the ocean basin volume based on reconstructed seafloor. Circle the letter of each sentence that is true about midocean ridges.
The diagram on the reverse side depicts an area of the ocean floor where different plates are shifting due to plate tectonics. Scientific ocean drilling has spurred remarkable progress in understanding many global processes. This theory, introduced by harry hess, was proven as patterns of magnetic. Altimeter data collected using satellites has been used to generate lowresolution maps of 100 percent of the ocean bottom.
D seafloor bedrock is younger near the ridge and older farther away. Lithospheric plate with oceanic crust is dragged down at. Seafloor featureapping the manoa hawaii edu source. Pdf the growth of the continental crust has shaped the evolution of the. The caribbean basin is located southeast of the area labeled m on this map. Ocean relief features are divided into major and minor relief features. Seafloor spreading is a process that occurs at midocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge answer choices. Sea floor spreading worksheet pdf with images sea floor. Seafloor spreading is a process that occurs at mid ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge answer choices.
Quiz explaining seafloor spreading and plate tectonics theories. The theory has caused a revolution in the way we think about the earth. Bthe ridge is the location of irregular volcanic eruptions. Large pieces of the lithosphere that float on the asthenosphere are called. Seafloor spreading seafloor spreading is the process by which plate tectonics produces new oceanic lithosphere at ocean ridges.
Mid ocean ridges rifts normally form where tectonic plates are athe bedrock of the ridge and nearby seafloor is igneous rock. The general questions addressed in this study were. Simulating community effects of sea floor shading by plankton. The shape of the ocean floor, its bathymetry, is largely a result of a process called plate tectonics. An editorial board was established consisting of representatives from the circum.
Large number of signals can be obtained from a single point from the seafloor. Be a seafloor explorer and run your own marine research project by playing our online game. The great pacific garbage patch is more like a trash soup, with debris suspended throughout the water column and floating at the surface. The tops of some midocean ridges are split by a steepsided valley.
Deep ocean trenches subduction mid ocean ridge hot spot convection currents basalt density strikeslip fault mantle folded mountains volcanic mountains use the word bank above to complete each statement. Differs from conventional single channel seismic in that very long streamers of hydrophones are commonly used. As oceanic crust moves away from the shallow midocean ridges, it cools. Magma flows up between the plates and forms new crust. Learn vocabulary, terms, and more with flashcards, games, and other study tools. It is an interconnected system of underwater mountains that have developed on newly formed ocean crust. Aa bb cc dd the most recently formed bedrock is found at location 4base your answer to the following question on the map of the midatlantic ridge shown below.
Midocean ridges rifts normally form where tectonic plates are athe bedrock of the ridge and nearby seafloor is igneous rock. Oceanic crust near the midocean ridge is than the crust that is. Cseveral faults cut across the ridge and nearby seafloor. Molten rock pushes up from the asthenosphere and pushes the plates apart at the midocean ridge. Seafloor spreading and plate tectonics school of ocean and. The outer rocky layer of the earth includes about a dozen large sections called tectonic plates that are arranged like a spherical jigsaw puzzle floating on top of the earths hot flowing mantle. An example of a transformshearsliding boundary is a. Seafloor spreading is the mechanism by which new seafloor lithosphere is constantly being created at midocean ridges. Scientific ocean drilling the national academies press.
Eventually it is pushed into a deep ocean trench and subducted. Begin by labeling the parts draw an arrow to indicate which feature you mean. When the seafloor is spreading, where does the molten material rise from the mantle and erupt. Much of this trash is small, weathered pieces of plastic.
The vertical lines in the diagram represent faults and fractures within the ocean floor bedrock. Aug31 ch 2 school of ocean and earth science and technology. Students are expected to know about the makeup of the earths layers, what the. The landscape of the ocean floor is much like what you see on land, just way more dramatic and without all that life. Seafloor spreading and subduction zones directions. This is an online quiz called ocean floor features. Pdf seafloor spreading evolution in response to continental growth. The old crust gets pushed to the side as new crust is formed. Explore a timeline about how we have learned about the oceans. The great pacific garbage patch is an expanse of ocean void of life and littered with islands of floating trash. Deepocean trenches subduction midocean ridge hot spot convection currents basalt density strikeslip fault mantle folded mountains volcanic mountains use the word bank above to complete each statement. Introduction to the worlds oceans pages 52 67 bathymetry of the seafloor 1. Oct 16, 2018 this pin was discovered by eriyoussef. Ocean floor features national oceanic and atmospheric.
Search help in finding ocean floor features online quiz version. Ocean relief ocean relief is largely due to tectonic, volcanic, erosional and depositional processes and their interactions. It is unusual in that the tectonic plate under the caribbean is bounded on. Lithosphere with new oceanic crust is formed at mor, then spreads laterally as if on conveyor belt. Sep 19, 2018 modelling the ocean floor lab seafloor spreading questions q sea floor spreading homework ocean floor flashcards quizlet whats people lookup in this blog. Line xy connects locations in north america and africa. Continental drift, sea floor spreading and plate tectonics plate tectonics is a theory developed in the late 1960s, to explain how the outer layers of the earth move and deform. Most geologists accept these tests as verification of plate tectonics.
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