Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Ogasawara Islands' has mentioned 'Subduction' in the following places:
Occurrence Sentence Text Source
They lie above a subduction zone between the Pacific Plate and the Philippine Sea Plate.
The crust of the Ogasawara Islands was formed by volcanic activity when subduction began 45xe2x80x9350 million years ago, and is composed mostly of an andesitic volcanic rock called boninite, which is rich in magnesium oxide, chromium, and silicon dioxide.