Answer:
Big cities, convenience.
Explanation:
In the most densely populated areas of Europe and Russia, there are cities which means that things will be close to people. Cities provide convenient for people, they are more populated.
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.
Collision is most likely to cause earthquakes
Explanation:
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