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Image Credit
/-/https/www.sciencebuddies.org/Files/4644/15/F2-sediment-types-pebbels-sand-mud_img.jpg)
Description:
Side-by-side images of pebbles, sand and clay
Source:
Public domain
License:
Open source
Source URL:
http://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Ripples_sand_and_wormcasts.jpg/450px-Ripples_sand_and_wormcasts.jpg
/-/https/img.youtube.com/vi/9RtRKIs21Ws/0.jpg)
/-/https/img.youtube.com/vi/rTLQAf3DOaE/0.jpg)
/-/https/img.youtube.com/vi/6fx0PEx0g5k/0.jpg)