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pebble

A pebble is a clast of rock with a particle size of 2 to 64 millimetres based on the Krumbein phi scale of sedimentology. Pebbles are generally considered larger than granules (2 to 4 millimetres diameter) and smaller than cobbles (64 to 256 millimetres diameter). A rock made predominantly of pebbles is termed a conglomerate. Pebble tools are among the earliest known man-made artifacts, dating from the Palaeolithic period of human history. A beach composed chiefly of surface pebbles is commonly termed a shingle beach. This type of beach has armoring characteristics with respect to wave erosion, as well as ecological niches that provide habitat for animals and plants. Inshore banks of shingle (large quantities of pebbles) exist in some locations, such as the entrance to the River Ore, where the moving banks of shingle give notable navigational challenges. Pebbles come in various colors and textures and can have streaks, known as veins, of quartz or other minerals. Pebbles are mostly smooth but, dependent on how frequently they come in contact with the sea, they can have marks of contact with other rocks or other pebbles. Pebbles left above the high water mark may have growths of organisms such as lichen on them, signifying the lack of contact with seawater.
coal in the hands - coal held in hands
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coal in the hands

Added month ago by Lola

21

coal - raw material - Raw coal - black gold, held in hands
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coal - raw material

Added month ago by Lola

10

Colorful puzzle - colorful jigsaw puzzle
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Colorful puzzle

Added 2 months ago by andi

80

flowers c.d - red rose on the stones
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flowers c.d

Added 2 months ago by stachna

24

Jigsaw puzzle - colorful jigsaw puzzle
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Jigsaw puzzle

Added 3 months ago by andi

44

Colorful puzzle - colorful jigsaw puzzle
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Colorful puzzle

Added 4 months ago by andi

35

Valentine's puzzle - colorful jigsaw puzzle
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Valentine's puzzle

Added year ago by andi

23

Composition - complicated puzzle
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Composition

Added year ago by andi

50

Jigsaw puzzle - complicated puzzle
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Jigsaw puzzle

Added year ago by andi

32 1

as real - kitten like a real one made of stones
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as real

Added year ago by Halina

33

ogródek - rabaty, ścieżka w ogrodzie
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ogródek

Added year ago by Bożenka

129

serce z kamienia - miłośc po niemiecku z kamieni
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serce z kamienia

Added over a year ago by zuzanna

7

LUBIĘ UKŁADAĆ PUZZLE - taka sobie bużka z muszelek
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LUBIĘ UKŁADAĆ PUZZLE

Added over a year ago by IZABELA

24

budowla z płaskich kamieni - kamienie,plaża,piasek,wieża
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budowla z płaskich kamieni

Added over a year ago by wieslawa

103