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Biogeochemical Cycles
Biogeochemical Cycles

... COMMONALITIES AMONG THE CYCLES: >exist in the hydro-, litho-, biosphere, & sometimes the atmosphere >there are “pools” or reservoirs >they are changed chemically or biochemically >there are “fluxes”, or movement between pools >transformations (changes) are important & can lead to positive or negativ ...
Oceanic Crust
Oceanic Crust

... • Called oceanic island if ...
Chapter 11 - COSEE Florida
Chapter 11 - COSEE Florida

... SC.912.L.17.3 - Discuss how various oceanic and freshwater processes, such as currents, tides, and waves, affect the abundance of aquatic organisms. SC.912.L.17.8 - Recognize the consequences of the losses of biodiversity due to catastrophic events, climate changes, human activity, and the introduct ...
Chapter 13
Chapter 13

... immersed in a molten outer core) surrounded by a mantle of deformable ultramafic rock which is covered by a brittle crust composed of ocean floor mafic rocks and continental felsic rocks. ...
ESL 1 Review Chapters 8 9 10 11 Plate Tectonics Term/Concept
ESL 1 Review Chapters 8 9 10 11 Plate Tectonics Term/Concept

... warmer. The warm air above the ocean rises, and the cooler air above the land moves over the ocean to take its place. ...
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3.3 Plates Move Apart

... setting breaking gas and water lines and causing fires that could not be stopped ...
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Krasting PowerPoint on Circulation

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Supporting the theory of Plate tectonics

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Study Guide Answers

... 6. How do mid-ocean ridges support both the theory of continental drift and plate tectonics? (hint: what happens there?) When new ocean floor (sea floor spreading) was being produced by plate tectonics (diverging boundaries) 7. What type of boundary causes sea floor spreading? divergent ...
sample paper
sample paper

... This results in the water becoming denser and therefore sinking. The water then flows towards the Antarctic region where the salinity increases due to the freezing of water. When water freezes the salt does not freeze and remains in the surrounding solution, therefore increasing the salinity of the ...
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... sperm whales in the Southern Ocean, whaling has resulted in an extra 2 million tonnes of carbon remaining in the atmosphere each year. ...
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Plate Tectonics - Teacher Background File

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Oceanography Seminar-Oscar Abraham Sosa (PDF)

... bacterial life in the sea. Bacteria, in the process of consuming and decomposing marine organic matter, return carbon dioxide (through respiration) and inorganic nutrients to the water column making them key regulators of the cycles of carbon and of marine productivity. Yet we know very few details ...
Marine Sediments
Marine Sediments

... photosynthesis, (2) this organic matter sinks into deeper waters, (3) bacterial decay releases carbon dioxide and other nutrients, making them available to be used again by phytoplankton, until (4) ultimately deposition locks away the carbon in ocean sediments. ...
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... c. open ocean. d. surface zone. _____ 21. Stream-like movements of cold, dense water near the ocean floor are called a. surface currents. b. deep currents. c. bottom currents. d. mixing currents. _____ 22. One of the most important roles of the ocean is to a. add oxygen to the atmosphere. b. trap he ...
Sea Floor Spreading
Sea Floor Spreading

... along both sides of a mid-ocean ridge as a new crust is added.  The ocean floor moves like a conveyor belt, carrying the ...
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Benchmark 3 Answer Key

... 13. What geological features are created at convergent boundaries? Mountains (2 continental plates), trenches (oceanic and oceanic plate), volcanoes (continental and oceanic plate) 14. What geological features are created at divergent boundaries? Sea floor spreading- makes mid ocean ridges (2 oceani ...
APES Review: Earth Systems and Global Changes
APES Review: Earth Systems and Global Changes

... land (N. America) it moves east due to our prevailing global winds, loses strength and “dies out” over cooler ocean waters or land. (Saffir Simpson scale)  Tornado – cyclonic, low pressure system that is formed because of the turbulence and wind shear associated with severe thunderstorms. (Enhanced ...
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Study Guide for Oceanography Test 2016

SGES 1302 Lecture6 - Department Of Geology
SGES 1302 Lecture6 - Department Of Geology

... snakes around the world. This band is particularly evident around the edge of the Pacific Ocean where it is known as the Ring of Fire. Within the ocean basins near these bands are some of the deepest oceanic waters on Earth. These linear areas of anomalously deep water are called trenches. In the la ...
Southeast Asia`s Seas:global treasures of biodiversity—in peril
Southeast Asia`s Seas:global treasures of biodiversity—in peril

Notes 9-4 Sea Floor Spreading Name p. 331
Notes 9-4 Sea Floor Spreading Name p. 331

... Even though there is no light and freezing temperatures at the depths of the ocean, the ocean floor is still teeming with _____________. At the East Pacific Rise, ocean water sinks through ________________, or ______________ in the crust. The water is heated by contact with hot material from the ___ ...
Continental Drift Hypothesis - states that the continents had once
Continental Drift Hypothesis - states that the continents had once

... Plate Tectonics - the theory that proposes that Earth’s outer shell consists of individual plates that interact in various ways and thereby produce earthquakes, volcanoes, mountains, and the crust itself. Plate - one of numerous rigid sections of the lithosphere that move as a unit over the material ...
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How accurately can we measure density within the Earth?

... chemically differentiated ...
The Sea Floor
The Sea Floor

< 1 ... 126 127 128 129 130 131 132 133 134 ... 147 >

Anoxic event



Oceanic anoxic events or anoxic events (Anoxia conditions) refer to intervals in the Earth's past where portions of oceans become depleted in oxygen (O2) at depths over a large geographic area. During some of these events, euxinia develops - euxinia refers to anoxic waters that contain H2S hydrogen sulfide. Although anoxic events have not happened for millions of years, the geological record shows that they happened many times in the past. Anoxic events coincide with several mass extinctions and may contribute to these events. These mass extinctions include some that geobiologists use as time markers in biostratigraphic dating. It is believed oceanic anoxic events are strongly linked to slowing of ocean circulation, climatic warming and elevated levels of greenhouse gases. Enhanced volcanism (through the release of CO2 and other greenhouse gases) is the proposed central external trigger for the development of these events.
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