The earth could very well be flat,but it does have a tremendous depth. Job;11; 9-Job might have had some insight when he said that God's wisdom is measured longer than the earth.,and broader than the sea. Jesus also said that the Gospel shall be preached to the ends of the earth. Isaiah; 11;12; says ;And he shall set up an ensign for the nations,and shall assemble the outcast of Israel, and gather together the dispersed of Judah from the four corners of the earth. Also Revelations;7;1 says;And after those things I saw four Angels standing on the four corners of the earth. I have never known anything round having corners.