Provide a natural example of a system without an energy source. ...

[torybrooks]

Provide a natural example of a system without an energy source. What will be an ideal response?

Question 2

Explain how Earth's internal and external energy sources work together to shape the surface of the
  Earth. What will be an ideal response?

[djpooyouma]

Answer to Question 1

There is no natural example. All natural systems require an ultimate energy source.

Answer to Question 2

Earth's surface environment is a balance of forces, some imposed externally (sunlight and related
winds, rainfall), some imposed internally (tectonic forces). Life modifies the interaction of these
forces, helping create soils and the landscapes to which we are accustomed.

[torybrooks]

Thanks for the timely response, appreciate it

[skipfourms123]

Excellent