The region of eastern europe is located north of the sea. a. baltic b. bering c. caspian d. mediterranean

The correct answer is - C. Caspian.

The region of Eastern Europe, can be said that it is located north of the Caspian Sea, but in reality that is only one part of the whole region, while the rest will be excluded by that logic. North of the Caspian Sea is the territory of Russia, and Russia takes up a very big portion of Eastern Europe, but the rest of the countries will be excluded, especially the Balkan countries that also fall into this region, but are in general more on the south from the Caspian Sea.

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