hot deserts often have reliable sunshine, ancient cities and ruins and beautiful landscapes. what industry has the opportunity to develop there because of these factors

The industry that can develop in these areas is the tourism industry.

Explanation:

The hot deserts are often seen as places that have no potential for the development of industry, but this is not really the case if what they offer is utilized properly. In numerous hot deserts around the world, there are well preserved ancient cities and ruins, and those are very attractive to the people. Also, something that is often seen as a disadvantage in the hot deserts, the almost constant sunshine all year round, is actually an advantage because the weather conditions are almost always stable.

The tourism industry can develop very well in such areas if the promotion and tours are well organized it can be of big importance for the development of the economy. Such places are the Nile River valley in Egypt, Tigris and Euphrates river valleys in Iraq, parts of the coastline of Peru, and many others. Egypt is the only one that has really managed to profit from this and has a well-developed tourism industry. Peru still mostly focuses its tourism on the Inca legacy, though it gradually tries to promote the other ancient remains, while Iraq is in a terrible socio-economic and political situation so it cannot really do anything in this in the near future.

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.