Where does most of the metabolic activity in a cell occur?
in the dna
in the cytoplasm
in the cell wall
in the nucleus
in multicell organisms, which is the most complex level of cellular organization?
tissues
systems
organs
cells

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