Global warming. If the center of our earth weren't warming continuously or weren't as active, we would have as much global warming.
Answer: Question 1 : 400 years. Question 2 : Its best know for a large number of pyramids. Question 3 : I'm not sure, sorry. Question 4 : Physicians, dentists, lawyers. Question 5 : End of a dynasty, Fragmented rule, & Despair and collapse.
Explanation:
The answer to this is facts
