ROCKS

Rock is an aggregate of minerals
It may contain metals and non-metals
there are many types of it
So prepare your identification kit

Let us begin with igneous
It forms when magma cools
Basalt is volcanic and mafic
While Granite is plutonic and felsic.

Rhyolite is also volcanic but felsic
While Gabbro is plutonic but mafic
Andesite is intermediate but volcanic
While Diorite is intermediate but plutonic

Another type is sedimentary
Which is important in paleontology
For they contain fossils
buried for many years

Shales and Sanstones are clastic,
While Limestones and Dolostones are non-clastic
they form after rock's erosion
and then deposition,compaction, and cementation

What happens when rock is subjected to pressure?
Or maybe on great temperature?
Is it changed and minerals became elongated?
Oh it becomes metamorphic!

Have you heard about gneiss?
Yes it is really nice!
How about slate, phyllite, schist, and marble?
they are all adorable!

Geology rocks!
Because they study rocks!