Which river is the longest in the world?
The Nile
Which planet is (the) closest to the sun?
Mercury
Which mountain is the highest in the world?
Mount Everest
In which country did the world's worst nuclear disaster take place in 1986?
Ukraine
What is the fastest thing we know?
Light
Which of the following countries is larger than Canada? (CHINA/ BRAZIL/ RUSSIA/ AUSTRALIA)
RUSSIA
Which is the furthest planet from the sun?
Pluto
What is the largest animal in the world?
Blue whale
Which country has the lowest population in the world?
Vatican City
Which one is older: QUOC TU GIAM (Hue) or VAN MIEU (Hanoi)
VAN MIEU (Hanoi) 1070
