Why is the earth divided into layers

The interior of the Earth, like that of the other terrestrial planets, is chemically divided into layers. The Earth has an outer silicate solid crust, a highly viscous mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core.

predicting long term climate trends reliably is much easier than predicting short term weather, owing to the different data sets used for each.

explanation:

the answer is b. hope this !