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39

"Sea" versus "lake" versus "just part of the ocean" is a bit fuzzy, but there are two things that are universal about seas: They are saline. They are either endorheic or have a sea-level (tidally-influenced) connection to the ocean. Now, let's see how the Great Lakes look under these criteria. Saline? No, salinity is 0, give or take measurement error. ...


10

When the flow of water in a river accelerates, it can pick up more sediment from the river bed and transport it downstream. Alternatively, when the flow slows down, the transport capacity drops and the sediments suspended are deposited on the river bed. When a river goes into a lake, it transitions from the fast-flowing regime in the river to a very slow ...


8

From a geological point of view, the two are very different. The Caspian Sea is thought to be the remnant of an ocean that got cut off from the ocean system (similar to how the Mediterranean might have been periodically cut off and re-connected to the oceans) due to tectonic uplift and a drop in sea levels. The Black Sea was part of the same ocean, but has ...


7

I think there is some misunderstanding of the water balance of a lake, or to put it differently, why some holes in the ground are dry while some are filled with water (known as lakes). The linked articles contain lists of closed lakes, but I'll also try to explain how lakes are formed. Fresh water comes from the rainfall (and snow and moisture) that falls ...


3

The visibility or "clearness" is more a matter of suspended particulates, and organic material such as algae, than of dissolved material. For instance, runoff from glacial streams can be nearly opaque due to suspended rock flour, yet "pure" in the common sense of not having much in the way of algae &c. Conversely, some parts of the oceans can be very ...


3

My guess is that since ice (and the liquid water underneath it) is much better at absorbing thermal radiation than air, then even if the air temperature is below zero, the ice can heat up in the sun and melt a little bit. It will presumably then refreeze at night when there is no sun to keep it warm. This was probably also happening on the surface of the ...


2

Other answers have suggested some ways of classifying things into seas or lakes, which are good guides, but inevitably there are exceptions to all of them. Ultimately, the difference is not an oceanographic or hydrological one, but a semantic and cultural one. The names bodies of water have are historical, so what they are called is down to what somebody ...


2

An article here says 4 meters. (No statistical data however, just a general information page) Waves on Lake Baikal may reach a height of 4 meters. Sometimes they evaluated as 5 and even 6 meters, but it is most likely an estimation “by eye”, which has a large error. Height of 4 meters obtained by instrumental measurements on the high seas. Another ...


2

The lake is very clean and pure by the standards of some other lakes, but there are bound to be some harmless and beneficial impurities in there. The plants couldn't grow unless there was plenty of CO2 in the water, and it follows there is also oxygen. Nitrogen is dissolved from the air and nitrogen oxides are brought in by the rain. I would be very ...


2

I believe the lake shown in the YouTube video Adventure Oregon - Lost Lake draining into a giant hole is the exact same lake. That is incorrect, and that incorrect hypothesis resulted in a lot of incorrect reasoning. These are not the same lake. They are however close to one another. I apologize for being so harsh. Lost Lake is a shallow, transient lake ...


1

Obviously removing the silt will increase the erosion along the banks of the pond(the neighbors will probably not like this). It sounds to me like this pond is badly constructed if the erosion is eating away peoples property. the best option might be to fill in the area and use it for something else,a park-playground or simply let it become a wetland with ...


1

Cut a notch into the dam so the water drains to the level you want. The marsh will shrink to a smaller size.


1

That is what lakes and ponds do , fill with silt. Serious earth moving equipment is needed to slow Mother Nature. Our community has recently removed some silt with draglines, bulldozers , trucks , etc. I don't know the cost but certainly significant . They concentrated on certain areas to facilitate flow as we have a dammed stream that made roughly a 300 and ...


1

From the link provided by Keith McClary, the Aral had a salinity of about 1% and a max depth of 69 m. (Could not find average depth in the article.) The Caspian Sea, on the other hand, has a salinity of about 1.2%, max depth of 1,025 m, and average depth of 211 m. I think this is enough information to say that the Aral was not just a smaller version of the ...


1

Ecosystem benefits of submerged trees include providing growth locations and nutrients for algae, phytoplankton, molusks, and other organisms. They can provide, not only protection for fauna, but shading for refuge from heat. They can increase eddies and areas of low flow that can be beneficial for fish and other fauna. Some species take advantage of pools ...


1

Depending on the fauna within the rivers and lakes, submerged trees can be like reefs in oceans. They provide protection for fish and other fauna and they can also act as nurseries for certain types of fish. Submerged trees can sometimes be snags in waterways which increases the difficulty in navigating waterways, particularly for larger boats.


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