| Class: | 5C 17 |
| Name: | Summie Sit |
| Year: | 2017 – 2018 |
| 地質年代：
沒有資料
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Geological Age:
Unknow Structure: rock fragment (sand) (clay) |
| 形成：
由於大岩石的風化和侵蝕作用，岩石或石英的較弱部分被風化，並且水的波浪或運動導致這些岩石碎片的積聚，並沉積在沙灘上，河床下， 小溪床或海床。 原生物：沒有
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Formation:
Due to the weathering and erosion processes of a big rock, the weaker part of the rock or quartz are being weathered and the waves or movement of water lead to the accumulation of the theses rock fragment and are deposited on beach, under the river bed, stream bed or sea bed.
Living Specimens: none
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| 特性：
它們是鬆散岩石的碎片，它們按其尺寸分類： 顆粒狀礫石：2-4毫米 卵石礫石：4-64毫米
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Properties:
They are the fragment of loose rock, they are classified by their size: Granular gravel:2-4mm Pebble gravel:4-64mm
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| 用途：
河石(礫石)是一種重要的商業產品，它可以用來製作混凝土，建造道路和鋪設基礎。它也可以用於花園的裝飾。 水河石被廣泛應用於水族箱中，它可以為有益的細菌和繁殖場提供一個家，並為魚類提供更舒適的棲息地。 此外，使水族箱更具吸引力。
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Application:
Gravel is an important commercial product, it can use to make concrete, construct roadways and lay beds for the foundation. It also can use for the decoration of a garden. Aqua Gravel is widely used in the aquarium which can serve to provide a home for beneficial bacteria and a breeding ground and more comfortable habitat for fishes. Also, to make the aquarium more attractive.
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| 分佈：
它們通常被發現在任何河床，河床，海床和沙灘上。
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Distribution:
They are usually found in any river bed, stream bed, sea bed and on the beach with sand.
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