Density would be the most noticeable difference between the rock and the model.
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There is no difference really, between a punk rock picnic and a punk rock gig. Both of them are punk rock festivals, which means that there is lots of people coming to see it, bands performing live, people having fun, etc. The only difference might be that, at a punk rock picnic, there are some areas where people can sit and eat, whereas at a punk rock gig you can still eat, but you mostly stand up and do the pogo/moshing dance with the crowd, so that can be the only difference.
A rock is a rock, and a diamond is a gem.
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Michael Jackson is Mock Rock. The Beatles are Real Rock.
A rock column is made of many rock layers.
A rock is an aggregate of minerals; a mountain is a landform.
The difference between metaporphic and ignous rock are that ignous rock is formed by cooling of magma and metaporphic is formed by temperature and pressure changes inside the earth
rap vs rock
they both rock
One is a powder and the other is a rock