Explain how xrd can be useful to characterize nanocomposites, by taking polymer-clay nanocomposite as example

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

B? i feel like this is a trick  

Answercreating graphs and performing calculations;