Explanation

(a) * Plutonic rocks are formed beneath or within the earth's crust while volcanic rocks are formed on the surface of the earth
* Plutonic rocks have large crystals while volcanic rocks have small crystal
* Plutonic rocks are coarse grained while volcanic rocks are fine grained 

(b) Mode of formation of crater lake
* weakness develops in earth crust 
* molten magma is trapped within the earth
* crust cracks and joints develop in the areas of crustal weakness
* magma under pressure is ejected through a vent 
* magma is composed of ash and cinder
* a cone is built around the vent by the materials the vent is blocked
* subsequent eruptions blow off the top of the cone
* a depression is formed
* the depression is called crater

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