White with black stripes.
The name for such a hole is "caldera" which is a word of Spanish origin meaning "a pot" or a "cooking pot" (thing of cauldron!) - and this word is used because it resembles the shape of this hole.
Often the Calderas are filled with water forming lakes and often there is an island in the middle of the water.
Answer:
migration is a strong force for equalizing the gene frequencies of sub populations in a species. Provided that the migration rate is greater than zero, gene frequencies will eventually equalize.
Granite
T: Phaneritic, Pegmatitic
P: Craton. Near Intrusive bodies such as a batholith
Plutonic
Minerals: Major: Plagioclase, K-spar
Granite #2
T: Phaneritic
P: same as above
plutonic
minerals: Major: Kspar Minor: Quartz and plag
Syenite:
T: Phaneritic
P: intrusive body. common in sills and more mafic bodies.
minerals: mainly alkali feldspar and amphibole
