Rocks

The rock known as...
 Igneous is formed by molten magma
 As it cools, it could be
 Plutonic, intrusive
 Where magma's slowly coolin'
 Beneath the Earth's surface
 Or it could be volcanic, extrusive
 Red hot substance is blown from a mountain
 Felsic rock, ultrapotassic,
 Peraluminous, ultramafic
 Rocks are formed in so many different ways
 It just takes a couple hundred million days
 So next time you're out walking around
 Try to classify all the rocks that you have found
 The rock known as...
 Sedimentary tends to hold and carry
 All the resources that we use daily
 It's made of detritus, just dead organic matter and
 Evaporates, then compacted harder
 The rock known as...
 Metamorphic comes from other rocks
 It's smashed and heated under Earth's surface
 Caused by collision of tectonic plates
 Marble, gneiss, quartzite and slate