What types of economic activity dominate the Amazon rainforest and the savannas of central Brazil?

A. fishing in the Amazon and farming on the savanna
B. logging in the Amazon and ranching on the savanna
C. farming in the Amazon and logging on the savanna
D. ranching in the Amazon and manufacturing on the savanna

B. logging in the Amazon and ranching on the savanna

B. logging in the Amazon and ranching on the savanna.

To determine the types of economic activity that dominate the Amazon rainforest and the savannas of central Brazil, we can analyze each option and eliminate choices based on our understanding of the region's economy.

A. Fishing in the Amazon and farming on the savanna: While fishing is a significant activity in the Amazon, farming is not a dominant economic activity in the region. Therefore, we can eliminate this option.

B. Logging in the Amazon and ranching on the savanna: Logging is indeed a major economic activity in the Amazon rainforest due to its rich biodiversity and valuable timber resources. Furthermore, ranching, specifically cattle ranching, is prevalent in the savannas of central Brazil, such as the Cerrado biome. So, this option seems plausible.

C. Farming in the Amazon and logging on the savanna: The Amazon rainforest is not a major agricultural area due to its nutrient-poor soil and dense vegetation. Conversely, logging does occur in the Amazon to exploit its timber resources. As for the savanna, the dominant activity is ranching, not logging. Therefore, we can eliminate this option.

D. Ranching in the Amazon and manufacturing on the savanna: Ranching is indeed a dominant economic activity in the Amazon, where vast areas are cleared for grazing cattle. However, manufacturing is not typically associated with the savannas of central Brazil. Hence, we can eliminate this option.

Based on this analysis, the correct answer is B. Logging in the Amazon and ranching on the savanna.