Granite doesnot seem to occur naturally in Korea and Japan. Why?

Question

Granite is exported from South India to Korea, Japan etc.

Answer 1

This is because of their geotectonic position. Japan and Korea occur in "Ring of Fire", which is a chain of volcanoes representing plate boundaries. So you expect volcanic rcoks in these countries (with some sedimentaries). Granite is a plutoni rock, and is generally found in stable cratons like that of S.India.

Answer 2

There is nothing unique about Korea and Japan. What your are observing are regional patterns in surficial geology, based on their geologic histories. For example, you would expect that Hawaii has no granite because the islands are formed entirely from volcanoes. Most of the midwestern US has no surficial granite deposits; a large region of Utah, Colorado, Arizona and New Mexico are covered by shales and limestone.