Answer:
Both temperature and pressure increase as you get closer to the Earth's centre.
Explanation:
The pressure increases as you go deeper because there is always more weight from above.
The pressure goes from 1 atm at the surface to 3.5 × 10⁶ atm in the core.
The core is hot because of
- residual heat from when the Earth was formed
- the energy released by decay of radioactive elements.
Here’s a table of approximate temperatures in the various layers.
Layer T/°C
Crust 300
Upper mantle 1300
Lower mantle 3300
Outer core 4500
Inner core 6000