Specification Point 8.18:Recall that the gases produced by ____ activity formed the Earth’s early atmosphere The surface of the early Earth was molten for millions of years during which time there was no ____ surrounding the planet. Eventually ____ began to take effect and allow for ____ materials to slow and solidify forming ____ masses. Volcanoes formed on the land masses and released ____ from the Earth’s interior through violent ____. Earth’s gravity prevented the gases from ____ into outer ____ and they formed the atmosphere. Analysis of the gases conserved in the ____ record has allowed scientists to perform studies of the composition of Earth’s ____ atmosphere. It is thought that the atmosphere at that moment in Earth’s history was similar to that of ____ or Mars today, which consist mainly of ____. During a period of intense volcanic activity, large amounts of carbon dioxide and water ____ were released, as well as nitrogen, hydrogen, ____, methane and other gases. The early atmosphere therefore contained mainly CO2 and water vapour. There was little or no ____ present.

Atmosphere 1

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