Divergent+Oceanic+to+Oceanic

= = = Divergent Oceanic-Oceanic: //6 points-slightly vague intro-no clear mention of what the boundary actually is! Good image// = When a divergent boundary occurs beneath oceanic lithosphere, the rising convection current below lifts the lithosphere producing a mid-ocean ridge. = = = = http://mvsdperiod4.wikispaces.com/file/view/shalala.jpg/46129731/shalala.jpg

=Locations: // 4 points--lacking multimedia-no images-specific locations? Names of places? //= Oceanic to oceanic divergent boundaries are found in the ocean. they occur in locations where plates are moving away from each other. It occurs above rising convection currents.

=**Associated Geologic Features: //4 points-fracture zones? ridge islands? Iceland? Hydrothermal vents? no images---anything?// **= Mid-ocean ridges are formed by oceanic to oceanic divergent plate boundaries. They are formed when a divergent boundary occurs beneath oceanic lithosphere.

=**Associated Geologic Events- //8 points good content-credit for the animation below included here too// **= The actual plate boundary is located in a rift, or fault-bounded valley, which forms along the axis of a ridge. It is in this central rift that the process of sea floor spreading begins. The formation of new ocean crust at most divergent boundaries accounts for the high heat flow, volcanism, and earthquakes associated with these boundaries. In other words, volcanoes, earthquakes, formation of oceanic crust, and high heat flow, are due to the formation of new ocean crust at divergent boundaries.

= Interesting fact: // 4 points-what about Iceland? geothermal energy? magnetic reversals along ridge boundaries? // = People don't live along the boundary, because it's in the ocean, but people who live nearby can be affected by the earthquakes, volcanoes, and other natural disasters associated with it.

media type="file" key="divergeocean.mov" width="300" height="300" Questions: // 5 points-improper format-vague and open-ended // 1. Do divergent boundaries move towards each other or away from each other? 2. Where is this boundary found? 3. How are people who live nearby these divergent plates effected? //( you said above that nobody lives along these boundaries!?)// 4. What forms at these divergent boundaries? 5. Where does the process of sea floor spreading actually begin?

Answers: 1. They move away from each other. 2. In the ocean along rifts and fault bounded valleys. 3. They are mainly affected by earthquakes, but are susceptible to other natural disasters as well. 4. New ocean crust is formed, as well as mid-ocean ridges. 5. The process of sea floor spreading begins in the central rift.

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