What are some interesting facts about earth's inner core?

The temperature in the inner core is about 5400 degrees celsius.
Scientists believe that it might be growing.
The inner core is solid.
It is mostly made up of nickel and iron.

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Why the planet stays in orbit is because of inertia (object stays in motion until a force changes it’s motion) also the atmosphere and gravity!