Question

solve this, ...if u r brilliant.. its a 6 letter word 1. first 3 letter indicate biggest thing in world. 2. 2, 3, 4 letter indicate parts of human body. 3. 3, 4, 5 letter indicate part of circle.. 4. the whole word is the key of internet now. 101% brain work only one chance.... lets see who will find the answer.....

Answer 1

1- sea
2- ear
3- arc
4- search