The diameter of the Sun is about 1.4 x 106 km. The diameter of the planet Mercury is about 5000 km.
What is the approximate ratio of the diameter of the Sun to the diameter of
Mercury?
O A. 2.8 x 103
O B. 3.6 x 10-3
O C. 3.6 x 102
O D. 2.8 x 102

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