One U. S. dollar was worth 16 Mexican pesos in 2015, but in 2019 the U. S. dollar was worth 19 Mexican pesos. This means that in 2019 people received a higher value of Mexican currency in exchange for their U. S. currency.
Based on this information, which statement is true?

A. Demand for pesos decreased between 2015 and 2019, and demand for the U. S. dollar increased.
B. Mexican businesses made less money than American businesses between 2015 and 2019.
C. Demand for the U. S. dollar decreased between 2015 and 2011, and demand for pesos increased.
D. Fewer U. S. dollars were in circulation in 2015 than in 2019.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals

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