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is chalk a soft rock
is chalk hard or soft rock
is chalk a rock
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what type of rock is a chalk
is chalk a hard rock
is chalk a mineral or a rock
what kind of rock is chalk
what sort of rock is chalk
what rock is chalk
is chalk a weak rock
is chalk a sedimentary rock
what rock makes chalk
facts about chalk rock
is chalk a soft rock, is chalk hard or soft rock, is chalk a rock, is chalk a type of rock, what type of rock is a chalk, is chalk a hard rock, is chalk a mineral or a rock, what kind of rock is chalk, what sort of rock is chalk, what rock is chalk, is chalk a weak rock, is chalk a sedimentary rock, what rock makes chalk, facts about chalk rock
