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Jun: How old is the Earth today? Do you have any idea?
Sheena: As far as I know, Earth's age is more than 4
billion years now.
Jun: Wow! It is really old. It's the only planet where life
has originated and found habitability.
Sheena: That's true. It's our home and the only planet in our
solar system with liquid water on the surface.
Jun: I just wonder where does the name ‘Earth' come
from?
Sheena: I heard its name was taken from the Old English
and Germanic which means 'the ground'.
Jun: Wow! You really are brilliant! How did you know all
about our planet?
Sheena: I like reading. That's how I get these information.
