Answer: I would say the answer is D
Explanation: If population growth wanes the number of middle aged and younger people in the workforce drops. This slows down the production of many things leading to a plethera of problems. A good example of this is the current situation in Japan. They have virtually no population growth and an increasing amount of elderly with no care or support systems.
Three-fourths of the over 500,000 lakes in Europe are found in Russia, but it should be noted that many of these lakes are very hard to reach and access.
Answer:
c. the vegetation ......=)
Troposphere is the layer where the air is thin as well as very warm
Answer:
As economies advance, they require more energy. Given today's focus on greenhouse gases, coal usage will decrease. Natural gas is plentiful and is easily used for heat and as a feedstock for chemical production. Petroleum is also readily available and can be converted to energy and chemicals.
Explanation: All three resources are transportable and sources are located across the globe. However they require transportation to areas which don't have ready access. This requires roads, railways, pipelines and ships.
