| Date - Field | Tonga - Terrain |
2009 January Terrain | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |
2008 January Terrain | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |
2007 January Terrain | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |
2006 January Terrain | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |
2005 January Terrain | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |
2004 January Terrain | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |
2003 January Terrain | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |
2002 January Terrain | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |
2001 January Terrain | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |
2000 January Terrain | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |