PLEASE ANSWER THIS WITHING 45 minutes, within that time, easy to get best answer..HELP PLEASE?!?!?

Question

Okay...

1. Time when human culture developed (2 words, 8 letters, no space)

2. Covers three-fourths of Earth ( 1 word, 5 letters)

3. Half of Earth ( 1 word, 10 letters)

Best answer gets 10-20 points!!!

Answer 1

1.Stone-Age

2.Water

3.Hemisphere

Answer 2

How will you manage to award 20 points for the Best Answer?

Answer 3

I'm not sure about the first one.

2. water

3. hemisphere

Answer 4

2 words, no space ?

water

hemisphere

Answer 5

1. prehistory

2. water

3. hemisphere