Granite rocks are formed by underground magma. They can be very old and date back to four billion years. Granite makes up a large portion of the Earth. Granite is made up of quartz, horns-blend, and feldspar. Other Igneous rocks include: pumice, basalt, and pyrite.
http://science.nationalgeographic.com/science/earth/inside-the-earth/rocks-article/
Metamorphic Rock: Marble
Heat and pressure cause marble to look the way it does. The rock is made of calcium carbonate which eventually turns into marble. Marble also cannot melt; it just simply changes its form. It is cut and often used for counter tops. Other examples of metamorphic rocks include: quartzite, anthracite, and slate.
http://www.marbleworld.info/Iz_Seiten01/marble_granite.html
Sedimentary Rock: Sandstone
There are various types of sandstone, which can even be used to build houses. Sandstone can form underwater on the ocean floor or on earth. Sandstone has multiple pores and can be used as a filter for water. Other sedimentary rocks include: siltstone, mudstone, and limestone.
http://www.softschools.com/facts/rocks/sandstone_facts/369/
Link to site about soils:
http://soilquality.org.au/factsheets/soil-texture-measuring-in-the-lab
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