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I would say water, depending on what you're doing. I think they did finally find ice on Mars, but if it's something older, than water may be the answer.
LIQUID water. Many planets and/or moons have water, but Earth is the only known planet with liquid water. Actually, we have water naturally occurring in solid, liquid, and gas phase.
What else can I help you with?
What is the richest planet on earth?
The earth is the only planet on earth.
What is the significance of planet earth?
Planet earth is the only planet that we know of that has life on it.
What it a earth?
Earth is a are home planet ,and the only planet that contains life
Is Earth the only planet with Lava?
No, Earth is not the only planet with lava (magma), Venus has a molten core as well as Earth.
Is earth only planet that has nature?
No. Nature exists on and in every planet. Earth is, however, the only planet in our solar system to have life.
What is planet earth known for?
planet earth is known for being the only planet to support life
What planet is the only with drinkable water?
Our planet, the Earth is the only planet with drinkable water. It is the only planet in our Solar System with life and oxygen. Without the oxygen, there will be no life and water on Earth.
Is earth's moon a planet?
The moon is the (only) "natural satellite" of the earth. It is not a planet.
Why earth is a unique planet?
Earth is the only planet currently known to have life.
Which planet is the only planet known for life on it?
Earth
Is a planet living?
only earth is a living planet.
Is earth the only planet to give us zinc?
Well considering that Earth is the only planet we mine. The answer has to be yes.
