Question

hydrocarbons are a by - product of which of these? burning fossil fuels the troposphere the atmosphere agricultural dust

Explanation:

Hydrocarbons are compounds consisting of hydrogen and carbon. Fossil fuels like coal, oil, and natural gas are composed of hydrocarbons. When fossil fuels are burned (combustion), hydrocarbons are part of the emissions. The troposphere is a layer of the atmosphere; it is not a process that produces hydrocarbons. The atmosphere is a general term for the air surrounding the Earth and is not a source of hydrocarbons in this context. Agricultural dust mainly consists of soil particles, plant debris etc., not hydrocarbons.

Answer:

burning fossil fuels