Answer: contour lines .
_____________________________________________________
Answer:
Decline
Explanation:
From the studies that have been done it is expected that the global birth rate will decline after 40 years. There are many reasons for this expectation, some of which are the development of the less developed countries, the people from the villages to move to the cities, more and more people to be out of the poor category, and focusing on careers as the countries develop. Some nations are still expected to have relatively high birthrates, but the majority of the countries will have significant drops in the birth rates, thus the global population will gradually start to slow down its growth, and further in the future stagnate, and probably starting to lower down gradually.
The answer is D. When carbon-based fuels are burned, they emit carbon dioxide into the atmosphere. Carbon dioxide is a greenhouse gas that causes a greenhouse effect that increases global temperatures hence global warming. However, it is important to note that carbon dioxide is not the only carbon-based greenhouse gas. Methane too is a greenhouse gas, several times more potent than carbon dioxide. Reducing the emission of these greenhouse gases, therefore, mitigates the risk of global warming.
