The early atmosphere 0.0 / 5 ? Chemistrythe early atmosphereGCSEEdexcel Created by: Jazzy15Created on: 24-03-19 14:08 What can gases be produced by ? volcanic activity 1 of 23 What did volcanic activity form ? the earth's early atmosphere 2 of 23 How much oxygen was believed to exist billions of years ago ? little or no oxygen 3 of 23 How much carbon dioxide was believed to exist billions of years ago ? a large amount of carbon dioxide 4 of 23 What was believed billions of years ago to contain ? water vapour + small amounts of other gases 5 of 23 What two gases are in today's atmosphere ? Nitrogen and oxgen 6 of 23 What percentage of nitrogen is in today's atmosphere ? 78 percent 7 of 23 What percentage of oxygen is in today's atmosphere ? 21 percent 8 of 23 What is the other 1 percent in today's atmosphere ? argon, water vapour and carbon dioxide 9 of 23 What is the evidence for there being gases billions of years ago ? the mix of gases released by volcanoes 10 of 23 What was the earth's temperature to start with ? Very hot 11 of 23 What happened to the planet over time ? It cooled, water vapour condensed and fell as rain to form the oceans 12 of 23 step 1 - what did carbon dioxide do in the oceans ? it dissolved 13 of 23 step 2 - what did the marine organisms use the dissolved carbon for ? to make calcium carbonate for shells 14 of 23 step 3 - The shells of dead marine organisms fell to the sea bed and become part of what ? the sediment 15 of 23 step 4 - Over millions of years the layers of sediment became squashed to form what ? sedimentary rocks 16 of 23 (cooling) step 1 - earth cools to form ? oceans 17 of 23 (cooling) step 2 - forms of plant life evolve in the oceans and what begins ? photosynthesis 18 of 23 (cooling) step 3 - oxygen builds up in the ? oceans 19 of 23 (cooling) step 4 - oxygen builds up in the ? atmosphere 20 of 23 describe a simple test for oxygen ? a glowing wooden splint relights in oxygen 21 of 23 a lighted wooden splint ignites what with a pop ? hydrogen 22 of 23 limewater turns milky in the presence of ? carbon dioxide 23 of 23
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