Final answer:
The first riddle's answer is A Hole, the second riddle's answer is The Horizon, the third riddle's answer is A Glove, and the fourth riddle's answer is A Stamp.
Step-by-step explanation:
The first riddle states "I am invisible, weigh nothing, and if you put me in a barrel, it will become lighter. What am I?" The answer to this riddle is "A Hole." A Hole is invisible, weighs nothing, and if you put it in a barrel, the barrel becomes lighter because the hole removes the material inside.
The second riddle states "I am always there, some distance away, somewhere between land and sky I lay, you may move toward me, yet distant I'll stay. What am I?" The answer to this riddle is "The Horizon." The horizon is always there, as it is the line where the land or sea meets the sky. No matter how much you move towards it, the horizon remains distant.
The third riddle states "What has four fingers and a thumb, but is not made of flesh, fish, bone, or fowl? The man who made it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?" The answer to this riddle is "A Glove." A glove has four fingers and a thumb, but it is not made of flesh, fish, bone, or fowl. The man who made the glove doesn't want it, the man who bought it doesn't need it, and the man who needs the glove doesn't know he needs it.
The fourth riddle states "What can go around the world, yet stays in a corner?" The answer to this riddle is "A Stamp." A stamp can go around the world when it is put on a letter or a package, yet it stays in the corner of the envelope or package.