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is chalk a hard or soft rock
is chalk hard or soft
is chalk a mineral or a rock
is chalk a type of rock
is chalk a rock
is chalk a weak rock
what rock is harder than chalk
what type of rock is a chalk
is chalk a resistant rock
what kind of rock is chalk
what sort of rock is chalk
is chalk a sedimentary rock
what rock is chalk
is chalk a hard or soft rock, is chalk hard or soft, is chalk a mineral or a rock, is chalk a type of rock, is chalk a rock, is chalk a weak rock, what rock is harder than chalk, what type of rock is a chalk, is chalk a resistant rock, what kind of rock is chalk, what sort of rock is chalk, is chalk a sedimentary rock, what rock is chalk
