Mariana Islands, island arc, a series of volcanic and uplifted coral formations in the western Pacific Ocean, about 1,500 miles (2,400 km) east of the Philippines
The Northern Mariana Islands, together with Guam to the south, compose the Mariana Islands. The southern islands are limestone, with level terraces and fringing coral reefs. The northern islands are volcanic, with active volcanoes on Anatahan, Pagan and Agrihan.
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Answer:
Mariana Islands, island arc, a series of volcanic and uplifted coral formations in the western Pacific Ocean, about 1,500 miles (2,400 km) east of the Philippines
Explanation:
The Northern Mariana Islands, together with Guam to the south, compose the Mariana Islands. The southern islands are limestone, with level terraces and fringing coral reefs. The northern islands are volcanic, with active volcanoes on Anatahan, Pagan and Agrihan.
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