Иностранный язык (английский ) для студентов направления "Техносферная безопасность"

a rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions (low pH)

something that is added to something else

is the establishment of a forest or stand of trees (forestation) in an area where there was no previous tree cover.

occurs when harmful or excessive quantities of substances are introduced into Earth`s atmosphere.

the amount or level of an alkali (= a substance with the opposite effect or chemical behaviour to an acid) in a substance:

solid air shell of the Earth, consisting of a mixture of gases, water vapor and dust particles