Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Describe the structure of Earth's core.

### Response:
The Earth's core consists of two distinct layers of different densities- the inner core and the outer core. The outer core is liquid and consists mostly of iron and nickel whereas the inner core is solid and composed mostly of iron. Both layers are extremely hot, with temperatures reaching up to 7500°C.