How well do you know geography (and comparatives/superlatives)?

Mount Everest is (a)   any other mountain in the world.

The Nile River is (a)   river in the world.

The Mariana Trench is (a)   ocean trench on Earth.

Antarctica is (a)   than any other continent.

Vatican City is (a)   country in the world.

Lake Baikal is (a)   freshwater lake in the world.

The Dead Sea is (a)   any other body of water on Earth.

Mount Kilimanjaro is (a)   any other free-standing mountain.

Asia is (a)   continent on Earth.

The Andes are (a)   the Rocky Mountains.