What would an orange grove farmer be most concerned about?
a) how to weather the rocks on the surface of the soil of her crops.
b) keeping the soil over her crops in place.
c)ways of making the soil less productive.
d)setting up a dam to pump water

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this

i think the answer is composed of atoms