Answer:
Because of LACK OF INFRASTRUCTURES
Explanation:
Despite the fact that Democratic Republic of Congo, DRC having various mineral resources such as cobalt, copper, diamond, tantalum, tin, and gold, they chose to export it instead of manufacturing it, because they lack the necessary infrastructures and expertise to refined the minerals to final products.
Also, due to invasion from neighboring countries' soldiers such as Burundi, Uganda and Rwanda, in 1998, who stole the mineral resources of DRC, and destroy their infrastructures, this led the country to export the few minerals after the invasion because its rural infrastructure was destroyed and mining outputs waned.
Hence, DRC chose to export their mineral resources instead of manufacturing it to final products, Because of LACK OF INFRASTRUCTURES to refine it.
ANSWER Importance of Controlled Variables
Lack of awareness of control variables can lead to faulty results or what are called "confounding variables." Additionally, noting control variables makes it easier to reproduce an experiment and establish the relationship between the independent and dependent variables
USA
Britian
Soviet union
France
China
Plateau because of the fresh water I think
