There are three major compositional groups of igneous rocks, mafic, felsic, and intermediate.
Mafic
The mafic igneous rocks are rich in magnesium and iron, making them a portmaneau of magnesium and ferric. They tend to be with dark coloration, with biotite and olivine being one of those rocks.
Felsic
The feslic igneous rocks are rich in elements that are forming the feldspar and quartz. Their coloration is lighter, and they come in numerous colors, with the granite and quartz being one of them.
Intermediate
The intermediate igneous rocks are in a way transitional rocks between the mafic and the felsic ones. They have a mixture of both mafic and felsic minerlas. Their coloration varies, and the andesite and dacite are some of them.
2 and 5 are Vertical angles
The correct answer is
<span>C. A forest fire that was caused by lightning
Lightning setting a forest on fire can happen regardless of the density because it's independent. if it was dependent it would be things like the number of predators because the number of predators depends on the numbers of inhabitants. Lightning setting it on fire is just bad luck.</span>
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Great lakes were formed from glaciers and slowly melted creating higher water levels creating more vegetation and economic growth.
