Religious and ethnical problems.
It was one of the largest empires of the world with many different ethnicities. The problem was to unite people under one rule.
Another problem was communication. It was hard to transfer knowledge and news to all parts of the empire because it was too large.
Your world is You. It is who you are now and who you grow to be. It is a timeline of your evolution in life. In this quiz you find out what your world is, and maybe you will even discover a little more about yourself. Pictures belong to their rightful owners. None are mine.
There has also been an increasing stream of work on the interactions between human societies and physical environments—long a central concern for some geographers, as illustrated by Clarence Glacken’s magisterial treatment of Western interpretations of nature in Traces on the Rhodian Shore: Nature and Culture in Western Thought from Ancient Times to the End of the Eighteenth Century (1967). Human abuse and despoliation of the environment are important themes introduced in their modern context by a pioneering American conservationist, George Perkins Marsh, in Man and Nature (1864), but they were minor concerns among most geographers until the late 20th century.
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Answer:
At the boundary with the core.
Explanation:
The mantle is the second layer from the top. It is bordered by the lithosphere above it, or rather by the crust, and by the outer core below it. The mantle is a layer which is in viscous state, being mostly consisted of molten metals and rocks. The temperature of this layer is not the same all throughout it, but it varies a lot. The temperature at its top part is around 200 C degrees, while the temperature at its bottom is around 4,000 C degrees. There's two reasons for this. One is that the core is very hot, so it makes the bottom part of the mantle very hot as well, and the other one is that the lithosphere is much cooler, as well as constantly getting new, cold, crust in it, which makes its top part much cooler. The mantle is the layer responsible for the movement of the tectonic plates on the surface, as it is the layer where the convection currents occur and drive the plates' movement.
They are both on the end of the Pacific rim. They both have an above average number of volcanoes, and they are steeper and more narrow then other mountain ranges. This is a result of their both straddling and colliding continental plates and being on top of very active geological fault lines.