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USGS CMG InfoBank: Life Was Not Always Everywhere on Earth

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Comment: 02:28 - 03:12 (00:44)
Source: Annenberg/CPB Resources - Earth Revealed - 2. The Restless Planet
Keywords: "James Sadd", life

Our transcription: One characteristic that makes Earth unique in our Solar System is life.
Living things can be found virtually everywhere on Earth, high on mountain peaks, the deep ocean basins, in the hottest deserts, and at the icebound poles.
Life has even been found in such seemingly inhospitable environments as active undersea volcanoes and hot acidic sulfur springs.
The presence of life clearly distinguishes Earth from its neighboring planets.
But life hasn't always existed here.
In fact, at the time the Solar System came into being, an event we estimate to have occurred about 4.6 billion years ago, Earth was a very different planet from the one we know today.

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