About 140 million years ago, volcanic activities occurred throughout Hong Kong, so Hong Kong comprises 75 percent of volcanic rocks and granitic rocks. The rock on the left side of the photo is a granite specimen in Hong Kong and the one on the right is a volcanic rock of young age collected abroad.
About 140 million years ago, volcanic activities occurred throughout Hong Kong, so Hong Kong comprises 75 percent of volcanic rocks and granitic rocks. The rock on the left side of the photo is a granite specimen in Hong Kong and the one on the right is a volcanic rock of young age collected abroad.
About 140 million years ago, volcanic activities occurred throughout Hong Kong, so Hong Kong comprises 75 percent of volcanic rocks and granitic rocks. The rock on the left side of the photo is a granite specimen in Hong Kong and the one on the right is a volcanic rock of young age collected abroad.
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