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  • Brainly User
2016-03-07T18:50:06+05:30

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Ice.Because in sand the friction is more than that of ice.
Surface of ice contains a thin layer of water which acts as lubricant.This makes people to slip on it.
hope i helped you!!
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..if ye than...........
onegaidayou,mark as brainliest!!!!!
2016-03-07T19:00:24+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
It is hard to walk on sand as sand consists of very small and loosely packed particles due to this when we put our leg into sand, sand loosens up and so our leg sinks. 
hence, it is hard to walk on sand.
ice is solid and is made up of larger particles ,so our leg's pressure wont effect it and we can walk without any disturbance.
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now CHEER UP!!!
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you will study about friction in the next class!
thnx