Compare the troposphere and stratosphere; which layer of the atmosphere is thicker and which is heavier?

The troposphere is the layer where we live, it is the lowest layer of the atmosphere.  While the Stratosphere is the layer where there’s no weather, it is above the troposphere.  The heaviest layer is the troposphere and the thickest is the stratosphere, which is 80 km thick.  

answer; i thinking 4.5 million. in sydney australia;

no sé si entiendes español pero te daría la respuesta si lo supiera, pero lo siento mucho