Hair:Rhino's horn is made of _____.
Rafflesia:It is the largest flower in the world.
Jupiter: Largest planet in the solar system.
Whale:______is the largest mammal in the world.
Russia:__________is the largest country in the world.
Graphite:The lead of the pencil is made up of ?
Water:H2O is the chemical formula of.
Green house:Carbon-di-oxide is the ________ gas.
Diamond:________ is the hardest known substance on earth.