Is Ravana worshipped in Sri Lanka ?
There are no temples for Ravana even in Sri Lanka where he was believed to be hailed from. But there is only one place where Ravana appears in Sri Lanka is outside of the border walls of a Shiva temple in Trincomalee where seems to be guarding the temple's Sanctum Sanctorum.
What is the difference between the Sea and Ocean ?
Seas are smaller than oceans and usually located where the land and ocean meet. Seas are partially enclosed by land. Seas are on the margins of the ocean and enclosed by land partially.
Can a Cockroach live without its head for a week ?
Yes they can. They breathe through little holes in each of their body segments and they are not dependent on the head or mouth to breathe. Cockroaches can stand , react to touch and move around even without its head.