Learn about The Formation of the Planet Mercury in this educational video from dizzo95.
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Male Speaker: And the surface continued to -. The inside mercury gets heavy iron core began to contract. The surface above cracked and great sections hundreds of miles wide were split over, leaving -- mile high walls of rocks called scars. Again there was a great flow of lava covering many of the large crevices and leaving smooth flat plains. This set the stage for the final episode in the history of mercury. A period of light, integrate plains. In this time, mercury; the internal heat that triggered many of the events in the planet's history turned off. And for three and half billion years mercury had remained as we see it today.