Answers

2015-09-05T22:56:00+05:30
Clay is very soft
it is obtained from sand
it is used for playing
it does not hurt people
it is made from chemicals too

gravel is hard
it is a stone
it cannot be used for playing
it hurts people and can leak extra blood
it is a natural resource

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2015-09-06T17:34:52+05:30
Clay is soft and gravel is hard

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