The outer core is the only Earth layer that is liquid.
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A partial lunar eclipse occurs when the Moon partly passes through the Earth's umbra. A total lunar eclipse occurs when the Moon fully passes through the Earth's umbra. When the Moon only passes through the penumbra, there is only a subtle darkening of its surface. The umbra and the penumbra are parts of the Earth's shadow.
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There is no life as we know it on Venus. The only technology there is what we sent to Venus in the various probes sent from Earth.
is the only planet that has water and it has oxygen for people to live in
the earth is different because the weather there is natural unlike the other planets were its freezing cold or boiling hot and is the only place that you can live and not die easily
It is not unique in any specific physical characteristic; the only thing unique about Earth is that - as far as we know - it's the only planet to harbor life.
Earth is the only planet currently known to have life.
What is unique is that it has beings who ask questions starting, 'what is unique about . . . ?'
The planet Earth is the only planet which we know to contain life. There may be others, but we have not found them yet. So for now, Earth is unique.
something unique, the only one on Earth
That's the only layer of earth the has weather or weather startst here first and moves down towards the earth.
earth is supposedly the only planet that can sustain life and has oxygen
Earth is the only planet known by us to support life.
It is the only planet that supports life. (As far as we know)
Earth is the only planet known to have life on it.