Turkish term (edited): �ak�l

pebble

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Note added at 6 mins (2004-10-31 19:29:11 GMT)
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pebble: a small usually rounded stone especially when worn by the action of water

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Note added at 8 mins (2004-10-31 19:31:01 GMT)
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or a small rounded stone that has been worn smooth by erosion

Turkish term (edited): �ak�l

???

Turkish term (edited): �ak�l

I just submit this answer since i want to add an agreement comment longer than 255 characters. And i want the asker not to consider this answer to be selected, it itself consists of other answers.
So;

First of all, i agree all answerers.
Pebbles are some small stones with a specific shape like smooth rounded and especially worn by water.

Gravels are some smal stones without a specific shape and are coarse. They are composed of rock fragments, broken in any way.

And
Shingles are definitely different. They are coarse beach gravels of small water-worn stones and pebbles or a stretch of shore covered with such gravels.

Please chose appropriate one from earlier answers.

Turkish term (edited): �ak�l

x

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Note added at 11 hrs 39 mins (2004-11-01 07:02:30 GMT)
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Yazım hatamı, \"pebble\" olarak düzeltirim.

Turkish term (edited): �ak�l

Each of the suggestions so far made are correct in essence, however it appears that they have different shades of meaning, viz:
-pebble: a small rounded stone, especaially worn by the action of water...
-gravel: small stones and pebbles, or a mixture of these with sand...
-shingle: small water-worn stones or pebbles lying loose esp. on a beach...+ a beach, riverbank or other area covered with such small pebbles or stones....
(all from Random House Websters' Electronic Dictionary)

Therefore I suggest that Asker's selection should better depend on the exact context used in the Turkish text.

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Note added at 9 hrs 19 mins (2004-11-01 04:41:32 GMT)
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i. especially olacak tabii ki...
ii. belki de bu notu yukarıda Asker\'e sorular bölümüne girmem daha uygun olacaktı...

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Note added at 12 hrs 25 mins (2004-11-01 07:47:41 GMT)
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Benimkisi yalnızca önerilenler arasındaki ince anlam farklılıklarını vurgulayıp Asker\'e daha bir yardımcı olmaya yönelikti. Değerlendirme dışı tutulması doğru olacaktır. Teşekkür ediyorum.