You didn't provide the sentence that is relevant in this case, however, generally if you would like to be objective in a sentence, you shouldn't include possible issues such as subjective thoughts, judgments, and similar things which have a negative impact on objectivity (and in reality destroy any remaining objectivity in a sentence).
Answer:
They have a negative charge since they are represented by a minus sign.
A prolonged drought.
I think it is A, a prolonged drought because you have limit to water, so that is the limited factor. Hope this helps!
Answer:
The correct answer is D. Desertification can happen as a result of non-sustainable agriculture.
Explanation:
Desertification is a process of ecological degradation in which the fertile and productive soil loses all or part of the production potential. This happens as a result of deforestation and destruction of the vegetation cover, the subsequent erosion of the soils, the overexploitation of aquifers, the over-irrigation and consequent salinization of the lands or the lack of water; human beings frequently favor and increase this process as a result of activities such as excessive cultivation and grazing or deforestation. According to data from the United Nations Environment Program (UNEP), 35% of the surface area of continents can be considered as desert areas, within these territories millions of people survive in conditions of persistent drought and food shortages. Among many other factors, it is considered that the expansion of these deserts is due to human actions.
The correct answer is C. Geothermal energy is easily accessible in all regions of the world.
Explanation
Geothermal energy is a type of energy that is obtained from the interior heat of the earth, which is manifested through hot springs or geysers, for this reason, it is considered a renewable energy source since the internal layers of the earth are always at high temperatures. Human has managed to develop ways to use the water vapor generated by hot springs to transform it into energy and thus provide electricity to cities. Therefore, the correct answer is C. Geothermal energy is easily accessible in all regions of the world.