Name the rock
How is it formed
What kind of rock
100
Sandstone
100
Sandstone
Beds of sand laid down under the sea or in low-lying areas on the continents. Pressed down by over-lying sediments
100
Coal, black, crumbly, commonly used
Sedimentary rock
200
obsidian
200
Obsidian
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth
200
Serpentine,
Metamorphic
300
Lapis Lazuli
300
Evaporite
Rocks formed by the evaporation of water are called evaporites - gypsum, anhydrous, halite. This evaporation may occur in either shallow basins on land or in the sea. When seawater evaporates, the salts precipitate and settle to the bottom, and the pressure forms the rock.
300
Novaculite, scoria
Metamorphic, Igneous
400
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Black, crumbly,commonly used in everyday life
coal
400
Limestone
Limestone is formed in two ways. It can be formed with the help of living organisms and by evaporation
400
andiste, sandstone
Igneous, Sedimentary
500
Granite
500
coal
Coal formed millions of years ago when the earth was covered with huge swampy forests where plants - giant ferns, reeds and mosses - grew. Heat and pressure produced chemical and physical changes in the plant layers which forced out oxygen and left rich carbon deposits.
500
limestone, evaporite, Lapis lazuli, obsidian
Sedimentary, Sedimentary, Metamorphic, Igneous