What layer of he atmosphere contains almost 80% of the amosphere total mass

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

Which factor that affects biodiversity?

On a spring day, a middle-latitude city (about 40? north latitude) has a surface (sea-level) temperature of 10 ? c. if vertical soundings reveal a nearly constant environmental lapse rate of 6.5 ? c per kilometer and a temperature at the tropopause of –55 ? c, what is the height of the tropopause?