Answer:
when atoms lose or gain electrons
Explanation:
It would be 4.6cgL not sure tho because I didint do that good in this
Answer is "an indicator".
Indicators change its color according to the pH of the solution. They shows different colors when the medium is basic and acidic.
Indicator pH range Acidic color Basic color
Methyl orange 3.1 - 4.4 red yellow
Phenolphthalein 8.2 - 10.0 colorless pink
Bromothymol blue 6.0 - 7.6 yellow blue
Desertification:Desertification is a type of land degradation in drylands in which biological productivity is lost due to natural processes or induced by human activities whereby fertile areas become increasingly arid.
Deforestation: the action of clearing a wide area of trees.
Climate change: Climate change describes a change in the average conditions — such as temperature and rainfall — in a region over a long period of time. NASA scientists have observed Earth's surface is warming, and many of the warmest years on record have happened in the past 20 years.
Extinction:
the state or process of being or becoming extinct.
I think it is calcium carbonate, from sedimentary rocks and such