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How do you interpret the formation of friable carbonate sandstone with dark lenses of clay, with littoral fossil bivalves and fish remains? An object have a volume of 400 cm3 and is made from a material that has a weight density of 4,000 N/m3. What is the mass of the object? Hi I was wondering are short tail opossums or southern flying squirrels legal even with a permit in AZ don't copy and paste laws? Do they have Wiener Dogs in IndoChina? Prove that for all n>=9 that there exist natural numbers x,y s.t. n=2x+5y.?