Which gases are released into the atmosphere when volcanoes erupt? select three options.

As our current atmosphere formed, the concentrations of various atmospheric gases fluctuated. match each gas with the explanation that best describes how its proportion changed during the evolution of the atmosphere.

Recently, there has been pressure to loosen clean air standards. use economic arguments to support or oppose this proposed action.

The pka of three different c―h bonds is given below. explain the observed trend in pka. select the single best answer.