Mudstone, shale, and limestone are examples of sedimentary rock ... such as tree trunks surrounded by lava and preserved as casts, but these are rare. Metamorphic rock is formed when existing rock is ...

Metamorphic rocks are formed when another rock is under ... shiny so the figures are attractive to look at. Chalk, limestone, shale, and sandstone are all examples of sedimentary rocks.

The gigantic deposit was found in metamorphic rocks in the Bohai Sea ... An example of metamorphosed rocks is shale, from which shale oil is extracted in the USA. Shale oil is produced within ...