How do geologists determine wether it is intrusive or extrusive?

Geologists determine whether a rock is an intrusive rock or an extrusive rock by examing their crystal/grain properties. Intrusive rocks, due to slow cooling of magma below the earth's surface, has larger crystal/grain texture and can be seen by the naked eye while the extrusive rocks, due to rapid cooling of magma above earth's surface, has fine crystal/grains, which cannot be seen by the naked eye.

While winters are rainy, summers are dry. regions with this climate are usually in the eastern part of the continents. they experience hot, humid summers and colder winters. precipitations have a regular distribution throughout the year, but hurricanes are common.