Answer:
Generally they are divided into the following categories: small towns-up to 10,000 inhabitants, 10,000-20,000, and 20,000-50,000; medium-size cities, 50,000–100,000 inhabitants; and large cities- 100,000-300,000 and 300,000-1,000,000 inhabitants.
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This shows a cinder cone volcano. It forms when cinders erupt again and again, piling up around the vent to form a steep, cone-shaped hill.
Uniformitarianism
fossils
radioactive decay
48 million
after
The youngest age of the shale is 910 ka. According to the principle of inclusions, the shale formed before the tephra, so the tephra must be younger than 910 ka.