C1 - The Earths Sea and Atmsophere

Question	Answer
What are the Early and modern earth's gas compositions? What's the evidence?	Early: 96.5% CO₂, 3.5% rest Today: 78% N₂, 21% O₂ O₂ not released by Volcanoes Fossil evidence shows photosynthesising organisms
What are the key factors of early atmosphere?	1. Volcanoes release gases 2. Water Vapour cools 3. Primitive Green Plants = photosynthesis 4. Carbon dissolves in Seas, locked in sediment & based lifeforms 5. Oxygen = Ozone 6. Lifeforms can survive so form
How did carbon based life forms form? What happened when they died?	CO₂ reacted with other substances in Seas Calcium Carbonate (insoluble) and Calcium Hydrocarbonate (soluble) became concentrated in sea creatures shells When they died, they formed Carbonate Rocks (sediment)
What are the 5 processes in the Carbon Cycle?	1. Photosynthesis 2. Respiration - plants and animals 3. Respiration - Microorganisms feeding (on dead organisms, links to 4) 4. Decay = Break down + CO₂ released 4. Combustion - Fossil Fuels burned
What is Global Warming? How have greenhouse gases increased?	Gradual temperature increase (Earth) Greenhouse gases trap energy from Sun 1. Combustion 2. Motorised Transport 3. Cattle farming 4. Deforestation
What is Photosynthesis Equation? How can you measure Oxygen?	6CO₂ + 6H₂O --- C₆H₁₂O₆ + 6O₂ Heat Copper with fixed air volume. 2Cu + O₂ --- 2CuO

Resource summary

	Created by charlotte.dredge over 8 years ago