Use stable octet in a sentence

What is a coast of using technology to transport water? a. cities can be built in otherwise uninhabitable areas. b. crops can be irrigated and grown in new areas. c. floods can be averted in flood-prone areas. d. freshwater supplies can be depleted in an area.

Me with these questions if you’re it sure don’t answer

What are the most explosive events that occur on the sun? umbras solar flares solar winds prominences