The air behind the front is cooler than the air it is replacing and the warm air is forced to rise, so it cools. As the cooler air cannot hold as much moisture as warm air, clouds form and rain occurs.
True if the map shows a scale.
The correct answer is - Greenhouse effect.
The Greenhouse effect is a process in which certain type of gasses in the lower atmosphere manage to trap the heat that is radiated from the surface of the planet.
The gases that are considered to be greenhouse gases are able to perform such a thing, despite being relatively low in amount compared to other gases, because they have much more complex molecular structure.
The molecular structure of this gases enables them to trap the heat, or rather to not allow to leave the atmosphere and return it back toward the surface, thus having huge effect on the climate.
Greenhouse gases are the carbon dioxide, methane, water vapor, nitrous oxide.
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Answer:
Since it's a paper about the rate of immigration and emigration, you could choose 2 countries from your top 10 list, and say that it surprises you that one has a high immigration rate, and that the other has a high emigration rate. For the spatial geography idea, try choosing a country and explaining why it;s included on the graph, for example, Germany, and what significance it has to the data.