Conversation so far:
where do most of earth's weather events take place
The troposphere is the lowest layer of Earth's atmosphere, and is also where nearly all weather conditions take place.
how much of the total atmosphere's mass does the troposphere contain
The troposphere contains 75% of the atmosphere's mass and 99% of the total mass of water vapour and aerosols.

Question: what is the height of the layer
Self-contained rewrite: what is the height of the troposphere