Which statement about Earth's layers is true? A. They all consist of liquid rock. B. They each vary in size and temperature. C. They are all under an equal amount of pressure. D. They will soon combine, forming a single, thick layer.

B

Explanation:

The do vary in size and temperature because as the layers go down to the core it gets harder and magma is more present

the first settlements began along the huang river because of the importance of the huang river in the beginning of china. it goes back to the story, “the tale of emperor yu”, which references the tale of the great flood, which was caused by the huang river and was believed to create and influence china’s making.