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Rocks
Rocks are naturally-occurring chunks of minerals.
The study of rocks is called Petrology, a speciality within the study of Geology. Geology itself is a specialty of Earth Science, so if you like rocks, you've already specialized quite a bit.
MoreClassifiction
Rocks are generally classified into three groups
- Igneous rocks -- formed through cooling magma
- Sedimentary rocks -- formed through the stacking of layers of minerals, other rocks, and the occasional organism
- Metamorphic rocks -- formed through intense pressure and/or heat to transform some other rock
Rock
This is a layer of rocks so it's probably sedimentary.
More rocks
I don't know what this is -- it could be an elephant enclosure for all I know -- but it's pretty.
Also rocks
This could be sedimentary but it looks kind of squished up and metamorphic to me.
Finally, rock
Whether it's sedimentry or metamorphic, it's bright and makes me smile.