Which of the following statements regarding development in sub-saharan africa is true?
a.
no country in sub-saharan africa is considered to be highly developed.
b.
most countries in sub-saharan africa are considered average with regard to development.
c.
most countries in sub-saharan africa have higher than average development.
d.
development in sub-saharan africa is higher than development in north africa.

Ageologist is working in an area with exposed sedimentary rocks and finds a well exposed sequence of stratified rocks. as he works through a thick sequence of limestone, he sees abundant large clam fossils that produce an interlocking texture suggesting a reef, but within the limestone section these clams disappear and the overlying limestone is made up primarily of fragments of corals. he now moves 50 km away and finds limestones interbedded with shales, and the limestones contain the same clam fossils he had seen previously 50 km away. as he continues through this section, the rocks become entirely limestone, and the clams disappear again with coral fossils above forming a reef structure. he concludes

How does lithosphere behave as a system ?

What term describes the government positions that officials who passed the civil service exam became a part of?