Question 1087070
The mass of pebble is 2000kg. The volume of water in a measuring cylinder rose from 4cm cube to 8cm cube of de pebble was gently lowad in to it, 
II. Draw  a diagram to illustate this.. 
Caleulate the density of de pebble in g/cm cube 
Find de density in kg/m cube
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I question the weight of the "pebble" at 2000 kg,  That's ~4400 pounds.
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Also, the volume of water doesn't change.  Do you mean the level?