Water vapour - This made up a lot of Earth's atmosphere when the global temperature was well above 100oC, it came from erupting volcanoes. , Molten - Very early in Earth's history it was so hot that the surface of the Earth wasn't solid it was liquid rock...lava., Hydrogen and Helium - These gases were so light that they just floated away into space, they were Earth's very first short-lived atmopshere., Ammonia and methane - Very small volumes of these gases were released from volcanoes early on in Earth's atmosphere., Nitrogen - This was first released into Earth's atmosphere by volcanoes, but because it is inert (doesn't react) it has stayed in our atmosphere ever since., Hydrogen - This was the second time this gas appeared in our atmosphere and it came from volcanoes., Gravitational field - This is what Earth has that holds a layer of gases covering it's surface, we call this layer of gases our atmosphere, Earth's crust - This is what we analyse to work out what gases were in Earth's early atmospheres., Carbon dioxide - This gas was the main one that volcanoes erupting released into Earth's early atmosphere, this gas also makes up most of Venus and Mars' atmosphere., Oxygen - This gas only started to make up a part of our atmosphere once there were green plants that were taking in carbon dioxide to do photosynthesis and releasing this gas., Cooling - When this happened to Earth the water vapour in the atmosphere condensed into liquid and fell as rain, this formed Earth's first oceans and made it possible for simple plants to evolve., Algae - This is a single celled plant and was one of the firts types of plants to evolve on Earth once the oceans formed, this did photosynthesis and released oxygen into the atmosphere.,

Match task - Earth's developing atmosphere

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