I would say C) Evaporation
Hope this helps, Good luck! (:
The study is an experiment in light of the fact that the scientists control one variable to decide the impact on another.
An experiment is an investigation intended to contrast advantages of an intervention and standard medications, or no treatment, for example, another medication treatment or aversion program, or to indicate circumstances and end results. This sort of study is performed tentatively. Subjects are chosen from an examination populace, doled out to the different investigation gatherings, and observed after some time to decide the results that happen and are created by the new medication treatment, treatment, or intercession.
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Land pollution is the destruction of Earth's soil and land. This can happen directly or indirectly because of human activities. A landfill is a good example of land pollution. Lots of plastic is disposed there. Harmful to the soil.
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The Nile River flows from south to north through eastern Africa. It begins in the rivers that flow into Lake Victoria (located in modern-day Uganda, Tanzania, and Kenya), and empties into the Mediterranean Sea more than 6,600 kilometers (4,100 miles) to the north, making it one of the longest river in the world.
A written language is one component of what scholars called a CIVILIZATION.
Civilization refers to the stage of human social development which is considered as very advanced. There are eight major elements of civilization and they are: Art, culture, religion, technology, trade/transportation, government, economy and written language.<span />