Why does relics and coins sink in the ground?

Pgill

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	Why does relics and coins sink in the ground? « on: March 21, 2011, 08:35:51 am »

I was thinking about why coins etc sink in the ground? I can understand if a coin is placed in a bowl of sand and it is vibrated or tapped carefully, the coin will sink down...... So I can understand that maybe in desert sand or on beaches that ground vibrations, earthquakes etc could sink a coin.... I also understand that wind could cause a coin to be buried, and maybe even flooding,,,,, like a tide coming in and out over the coin. And that even people walking on th coin could force the coin into the sand...... I am happy with that answer......
Now, what about hard ground? What forces that coin down..... I have even found some newish coins that have sunk down about 3" so it does not seem to be time that influences the sinking so much. The ground beng compacted would work different to that of sand...... So is it just wind, rain, and leaves etc that cause the item to sink?
What about in a park? The grass is cut weekly or monthly, but really the level does not change that much, but coins seem to sink in the ground. Grass grows upwards and pretty fast, that is why we cut is so much..... It would make more sense to me that the coin would be pushed up by the grass, and not pushed down..... Pulltabs, seem to have the roots of grass growing through them a couple of inches down? Huh?

? Now I am confused.....
Anyone got ideas about all this..... Just to add to this mystery, I have seen stuff lying on top of the ground for years, why does this stuff not sink?

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	Re: Why does relics and coins sink in the ground? « Reply #1 on: March 21, 2011, 09:07:53 am »

Gravity affects all for one.

About the Grass, as you stated the grass is cut over and over and over again.

What about all those grass clipping, being deposited over the coin over and over again.

Those clipping end up composting into soil and eventually cover the coin deeper over the years.

Wind, Rain, Snow (Snow do you have snow down there?)

What about Worms? They move the soil around a whole lot more then one would imagine.

Hard Ground? I bet that hard ground is a soggy sponge during your rainy season.

Living down here in south west New Mexico , we have tons of sand in some areas.

I've seen the Reverse happen from time to time.

I've seen a coin sitting atop a cone of sand at about a 1/1 ration starting just under the coin three inches above the ground. The winds scour the sands away and leave this strange cone of sand under the coin !

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	Re: Why does relics and coins sink in the ground? « Reply #2 on: March 21, 2011, 09:35:19 am »

Homefire, you have some good ideas on this problem..... I battle a little bit with the grass story :

in a park the grass is kept in immaculate condition..... do you not think that the coin would not show up on top quickly? It seems the coins on lawn seem to sink quickly as they would be seen easier by the eye on top of the lawn if it took time..... especially one of the silver coins from the USA, it would shine in the sun and show itself easily.... I don't know, it is quite a situation.... As some sink quickly, and other ites sit on top for years.... Shocked

Thanks for your input.... it will help us to get closer to the truth.....

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	Re: Why does relics and coins sink in the ground? « Reply #3 on: March 21, 2011, 12:48:41 pm »

WOW Homefire was all over that question "good show" Great

I read a couple of books some time ago that covered that in a chapter.he even nailed the worms and all the little critters that bore through the earth.
Well then here is my two cents and again Homefire said it all,I'm just summing it all up into two words.....MOTHER NATURE......my friend.......MOTHER NATURE

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	Re: Why does relics and coins sink in the ground? « Reply #4 on: March 21, 2011, 01:27:52 pm »

Thanks Steveo,

Yeah it is amazing what nature can do Great

I have seen mole hills with stuff in them..... When you see a lot of mole hills in a field, scan them all Grin

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	Re: Why does relics and coins sink in the ground? « Reply #5 on: March 21, 2011, 01:56:02 pm »

homefire hit most of it. Most of the "sinking" isn't sinkage so much as it's coverage as the soil level get's built up over time (the biggest exceptions, where real sinkage does occur are due mostly to insects and animals disturbing the underlying soil, or high moisture content or large soil grain size allowing the coin to slip between clumps of soil). But mostly it is a factor of soil erosion and soil deposit.

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	Re: Why does relics and coins sink in the ground? « Reply #6 on: March 21, 2011, 03:17:11 pm »

BitburgAggie_7377 thanks for the reply..... it seems like the majority say insects.... I can understand coverage, but on lush lawns, I am not sure there is much coverage, I may be wrong though..... This is quite an interesting subject.....

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	Re: Why does relics and coins sink in the ground? « Reply #7 on: March 21, 2011, 03:34:27 pm »

actually on lush lawns you get lots of coverage due to plant material decay and composting of plant material by animals.....same thing goes for deciduous forest floors........and if your plants grow and spread by runners or stolons like many grasses, the runners can grow over the coin have the effect of "pulling" the coin down. If you get a few of those criss-crossing over the coin, you've pretty much built a platform over the coin for additional "composting" to occur on with the coin forming a false bedrock. Examine a cross-section of sod and you'll see a very dynamic system at work with the top layer constantly being subsumed by newer growth.

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	Re: Why does relics and coins sink in the ground? « Reply #8 on: March 21, 2011, 03:38:01 pm »

BitburgAggie_7377, that makes lots of sense.... I think this subject has been sorted unless we get some other ideas from people.... Maybe what a person should do is to lay a few coins down and watch what happens over a couple of Months.... would be a great experiment...

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	Re: Why does relics and coins sink in the ground? « Reply #9 on: March 21, 2011, 03:45:03 pm »

	Quote:	Posted by Pgill
Maybe what a person should do is to lay a few coins down and watch what happens over a couple of Months.... would be a great experiment...

You might want to search that on the internet.....Seems to me that I remember an experiment like that being done in a terrarium and shown time lapsed on you tube. By the way, coin angle to the surface also factors in.....but you're right the subject probably has been covered pretty well.

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