Usted cuenta con 45,2 nM de una sustancia X liofilizada (nota: la liofilización es un proceso de secado de compuestos orgánicos que los lleva a polvo) y necesita preparar con ella una solución stock de 100 µM ¿Que volumen de agua destilada debe agregar al liofilizado?

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.

well the answer is 2!

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