Atmosphere of Earth surface. The refractive index of air depends on temperature, giving rise to refraction effects when the temperature gradient is large. An example of such effects is the mirage. "Atmospheric circulation" is the large-scale movement of air through the troposphere, and the means (with ocean circulation) by which heat is distributed around Earth. The large-scale structure of the atmospheric circulation varies from year to year, but the basic structure remains fairly constant because it is determined by Earth's rotation rate and the difference in solar radiation between the equator and poles. The first atmosphere consisted of gases in the solar nebula,
We Live: The Black Samurai We Live: The Black Samurai We Live: The Black Samurai is an EP by American rapper C-Rayz Walz. It was released on Definitive Jux in 2004. David Jeffries of AllMusic gave the EP 3.5 stars out of 5, saying: "Putting 'EP' on the cover keeps the collection from being over-judged, but hopefully won't keep it from being overlooked." Shawn Lawrence James of AllHipHop called it "a delicious appetizer for those craving food for thought in between his full length LPs." Nick Stillman of "Prefix" gave the EP a 6.0 out of 10, saying, ""We Live" shows no evidence of any