Emissions of Gas
Mercury has a very tenuous and transient atmosphere, containing small amounts of hydrogen and helium captured from the solar wind, as well as heavier elements such as sodium and potassium. These are thought to originate within the planet, being 'out-gassed' from beneath its crust. The Caloris Basin has been found to be a significant source of sodium and potassium, indicating that the fractures created by the impact facilitate the release of gases from within the planet. The Weird Terrain is also a source of these gases.
Read more about this topic: Caloris Basin
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“one pale woman all alone,
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