User:Sjense2/homework

1. A. http://en.wikipedia.org/wiki/Mid-ocean_ridge B. It describes what a mid-ocean ridge is, its formation prcesses, and its history. Mid-ocean ridges involve spreading centers, which create sea floor spreading. These are responsible for magma coming up from the asthenosphere and creating new crust. Two forces, ridge push and slab pull, are thought to be reponsible for the spreading of mid-ocean ridges, although there are other factors. C. I would alter the way it is structured. It starts with a description at the top, but it has another "description" section. It seems pointless. D. A successfully written part is the basic idea in the beginning that compels the reader to imagine sea-floor spreading. Something that can use improvement is the "formation processes" section in which they could portray it better. E. A successfull portrayal is the "slab pull" and "ridge push" force picture, while a figure that can use improvement is the first one in which it does not exactly portray sea-floor spreading too well. It seems as if it is a submarine mountain range that actually covers exactly where the magma is supposed to come out of the asthenosphere onto the crust.

A2. http://en.wikipedia.org/wiki/Sill_(geology) B2. It describes a sill as being an intrusion into such things as sedimentary rocks and other things. It also touches on the possibility that they can be confused with solidified lava flows. They go on to discuss "associated ore deposits" and "transgressive sills." C2.It could definitely use more content on material related to sills. This article does not seem very well developed, and could therefore use more content. D2. It describes the basic concept of what a sill is, very well, while it could use more work on its development of formation of sills. E2. They portray the basic concept decently in the first figure, while in the meantime, the truth is that there is only one figure that portrays any of the concepts. There is two other pictures that do not improve the reader's comprehension of what exactly a sill is. There could simply be more figures.

A3. http://en.wikipedia.org/wiki/Rift B3. It discusses the basic concept that a rift is where the Earth's lithosphere is being pulled apart. It discusses the fact that major rifts happen along mid-ocean ridges and it slighty touches on failed rifts. C3. An alteration I would make is right in the beginning, in the first sentence of the article. It says "the Earth's crust and lithosphere." This implies that the crust and lithosphere are two separate things, while the truth is that the crust is part of the lithosphere. D3. A successful part for the written communication is that it successfully portrays the basic idea of what a rift is, but it definitely needs more detail on types of rifts like failed rifts for example. E3. It portrays the horst-graben system well and convinces the reader of their importance but it can definitely use more visual figures in order to give the reader a better understanding of what a rift really is. It could use more figures to go along with the additional written content it requires.

2. A. I intend to do my page on magmatic underplating. It is the basic process that occurs when magma gets trapped and cools and solidifies under the crust which in turn thickens the crust. I will be dicussing the basic process itself along with when it occurs and other processes that are relevant to the process. B. Magmatic underplating is relative to many plate tectonic processes. Some of the magma that may not solidify may intrude into the crust and even rise up all the way above the crust and erupts at volcanoes and volcanoes are very relevant in terms of plate tectonics. Magma is less dense which is why it tends to rise. The reason that magma and magmatic underplating is so important is because of all of these things and magma is even responsible for creating new crust at mid-ocean ridges. C.I will start off with the basic definition of magmatic underplating. Once this is done, I will dicuss the processes that it is involved in and go into detail about each of these processes, one after the other. I may discuss the composition of magma and even the basics of magma itself. The obvious figure that will be included on this page is the process of magmatic underplating in which magma comes up from the asthenosphere building up under crust, thickening it. There may be other figures on this page (possibly a figure showing when the magma actually does intrude into the crust rather than stopping at the bottom for example), but other figures have not been completely decided on quite yet.