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Scientist believe that earths core is around 6000°c where does this heat come from

Northeastern china, north korea, northern japan containing coniferous forests, temperate grasslands, and agriculture, are all part of what climate zone? a. tropical desertb. desertc. humid subtropicald. humid continental

What are the similarities and differences in the way geologists and biologists approximate the age of the earth? justify your response in two or more complete sentences.