Why do East and South Asia form a region? Check all that apply.
A. They have the same forms of government.
B. For thousands of years, Asian civilizations were separated from
Europeans and Africans.
C. The earliest civilizations developed along the Indus and Yellow
River valleys in India and China.
D. They both have natural barriers like the Himalayas.

B. For thousands of years, Asian civilizations were separated from

Europeans and Africans.

D. They both have natural barriers like the Himalayas.

Explanation:

The reasons East and South Asia form a region is because of the following:

1. For thousands of years, Asian civilizations were separated from

Europeans and Africans - Over the years in human history, Europe and Africa had little or no contact with East and South Asia. Thereby, the region developed its civilizations and ethnic groups in its way or pace. This also made the region not form part of the advancing and conquering powers of the Mediterranean empires such as Rome, Egypt, Greek, etc.

Also, they both have natural barriers like the Himalayas which joined the two regions together as the Himalayas is formed between many countries in the area, including present-day China, India, Bangladesh, Nepal, etc

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