The type of seed dispersal that scatters seeds when the plant/fruit is dry and the seeds burst from them is called :

google my dude. if it doesn't show up ask me.

if you know your abc's you should be able to get your answer or just use google

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