Number one!
large/ocean/world?
What is the largest ocean in the world?
Pacific Ocean
Second/tall/building
What is the second tallest building in the world?
Merdeka 118 (Kuala Lumpur)
large/desert/world?
What is the largest desert in the world?
The Artic Polar Desert
second/high/mountain/world
What is the second highest mountain in the world?
K2
long/river/world
What is the longest river in the world?
The Nile
high/mountain/world
What is the highest mountain in the world?
Mount Everest
What is the smallest country in the world?
Vatican City