Answer:
Developing countries are countries that have a low standard living; these countries usually have a low gross national income per capita even though they are in an economical development. They also have a high gross domestic product per capita. Another economic measure is also industrialization.
Explanation:
Answer:
Scientists are able to understand Earth's interior by studying seismic waves.
Seismic waves travel at different speeds when they pass through different types of material, so by studying seismograms, scientists can learn a lot about Earth's internal structure.
Answer:
B
Explanation:
I cant see the other answers after B so its B because its not A
Answer:
cold air led to heavy use of coal, and the smoke from the coal fires was trapped close to the ground by a temperature inversion.
Explanation:
