The Eastern part of the African region is composed of a variety of traders and this has led to different developments and a mixture of different races including the Arabs, Africans and Persians. The cities in this area are rapidly growing, have been modernized with skyscrapers and huge buildings and also attracted many less fortunate people who ended up in slums. The answer is D.
I think it is the first one
Explanation:
Except in the crust, the interior of the Earth cannot be studied by drilling holes to take samples. Instead, scientists map the interior by watching how seismic waves from earthquakes are bent, reflected, sped up, or delayed by the various layers.
