permanent and variable gases permanent gases and variable gases 1000000*0,003

Name: GEOG 1250 Week 2 Notes
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SKU: 2643920
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GEOG 1250 WEEK 2 Notes green = possible test question yellow = terms pink = important Atmospheric Composition & Structure  Mixture of gas, solid, and liquid  Gravity  Earth’s atmosphere o 5.6 km rule of thumb >> pressure reduced by 50% every 5.6 km  At about 100 km, about 99.999% of molecules are below this. o How “high is the sky”? (upper limit) o Atmospheric density and pressure go hand in hand  The higher the density, the higher the pressure exerted  Early Atmospheric Composition consisted mostly of hydrogen and helium (lightest elements); were able to escape Earth’s gravity  Formation of Current Atmosp