Friday, March 19, 2004

Tonga, Relief

The summit of volcanic undersea mountains forms the two roughly parallel chains of the Tongan islands. Most of the islands of the western chain are classified as high islands because they have been raised well above sea level by repeated volcanic activity. Four of them are still active volcanoes. Some of the islands composed of lava formed by shield volcanoes, such

0 Comments:

Post a Comment

<< Home