Geologists sometimes find a type of igneous rock known as porphyry, which contains both large and small crystals. Which is the best explanation for the formation of this rock?
a) The rock experienced a two-stage cooling process, with initial slow cooling at depth followed by rapid cooling at the surface.
b) The rock experienced a two-stage cooling process, with initial rapid cooling at depth followed by slow cooling at the surface.
c) The rock experienced a two-stage cooling process, with initial rapid cooling near the surface followed by slow cooling at depth.
d) The rock experienced a two-stage cooling process, with initial slow cooling near the surface followed by rapid cooling at depth.
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