"concentrations of greenhouse gases in the atmosphere are at their highest level in more than 200,000 years and climbing sharply." -- us president bill clinton, at un general assembly special session, june 1997 the president's quote reflects a growing concern about a global warming b natural disaster c illegal immigrants d disease epidemics

The correct answer is A.

The emissions of greenhouse gases, which are mostly generated by the combustion of fossil fuels (oil, coal and gas), used massively on industries throught the world, are the main cause of the global warming.

At the UN General Assembly in 1997, President Clinton aimed to create some degree of awareness about this situation with his speech, as it is a global problem that need to be approched jointly by all nations.

the aksumite empire was an ancient kingdom located in what is now northern ethiopia from the period of 100 ad to 940 ad. its capital was the city of aksum. the kingdom established itself as one of the 4 great powers at its time, along with persia, rome, and china.

the kingdom was rich in goods like gold, iron, and salt. it established strong commercial ties with the regions governed by rome, egypt, and persia (arabia). aksum was a key location in this commercial network. trade was also facilitated with the introduction of the aksumite currency.

which of the following is a subsurface event that takes place during the rock cycle?