1) Seaweed
2) a) USA b) The Eiger c) George Mallory
3) Mugabi backwards is i-ba-gum (well done for working this out, thought it was a hard qu!)
4) a) Sheep b) Hickory Dickory Dock
5) a) Airlines b) Nile c) Mississippi d) Goodrem
6) 1940s
7) a) Galicia b) Poland & Ukraine
8) a) Beetle b) Prickly Pear
9) a) Narwhal b) Mammoth
10) a) Soweto = South West Townships b) Tribeca = Triangle Below Canal Street
11) The Falklands
12) Lots of nice answers available: The ultimate answer is 'U-Ni-Te-Ds-Ta-Te-S-O-F-Am-Er-I-Ca'. I was taking the country names from the UN 'short name' list, which lists the USA as 'United States', so that's the highest scoring answer here. For a full list of answers and discussion on the question,
click here.