User talk:Lydia.c/sandbox

Peer Review from Sandi Scripa

- Really good use of citations and hyperlinks to other Wikipedia articles - Maybe include something in the Global System section about how although ocean basins are becoming larger at oceanic ridge areas, this is also balanced from subduction in trench areas. (Though maybe this is already somewhere in the larger article?) - I think that your section on aragonite and calcite and spreading rates is really interesting. Is there any way that you could expand it? You might be able to find a paper on how community compositions differ between aragonite and calcite seas, which would be cool. - You have kind of an awkward sentence at the end of the Global System section. Sea level can change due to other factors (ex: build-up and melt of polar ice), though it is still good to emphasize that over geologic history seafloor spreading was one of the primary drivers as continents were drifting apart. - encyclopedia brittanica also seems to have a fairly developed page if you're looking for more ideas of where to expand.

Peer Review from Adam Briggs


 * The part about the Cretaceous period could actually go in the History section instead. The sentence that comes after, about sea-floor spreading would also fit better with the first sentence of the section that way.
 * I do think you should keep the current Global System paragraph and integrate your own information to explain how the ridges are connected and expanded. These ideas seem to fit together and could go in the same section.
 * In the Seawater Chemistry section, explain the Mg/Ca ratio and what you mean by "favored by seawater chemistry." It looks like you could do this by moving that first sentence after the following paragraph.
 * What is the skeletal Mg/Ca ratio? This part isn't clear. Could you explain the difference between skeletal chemistry and seawater chemistry? What are the consequences of the different types of precipitation?

Peer review from Ken Mochizuki
Summary This article is about how sea levels and seawater chemistry affects sea floor spreading. In the first section, global system, sea floor spreading is the expansion of the mid-ocean ridge that caused global sea-level rise in the last million years. Cretaceous period had high sea levels that were attributed to plate techtonics as thermal expansion and the absence of ice sheets alone cannot account for 100-170 meters of water level height back then compared to today. Mid-ocean ridges are global scale ion-exchange systems. Calcite seas are formed due to rapid spreading of mid-ocean ridges as mid-ocean ridges lower Mg/Ca ratio. Slow spreading of mid-ocean ridges heightens Mg/Ca ratio and create aragonite seas. Magnesium/Calcium ratio in an organism's skeleton varies with the Mg/Ca ratio of the sea water it was grown in, thus minerology of reef-building and sediment-producing organisms is regulated by chemical reactions occuring along the mid ocean ridge by the rate of the spreading of the mid-ocean ridge.

Major Points • The part about cretaceous period can have its own section under history. This sentence feels out of place in the global systems. • I still am not sure what global system is? Is it the increased rate of sea-floor spreading or the rise in sea level? This could use clarification, a statement on what global system is. • What is the significance of organisms having skeletal variations with ion ratio? This part needs more explanation. Also the ion exchange itself is not clearly explained in how the anatomy of the skeleton in animal changes. A new anatomy section could be added for further explanation.

Minor points •"Basalt reactions" in Seawater chemistry section could be explained better. — Preceding unsigned comment added by Com.gree (talk • contribs) 13:48, 11 April 2018 (UTC)