Okay, so a collection of stories. Great. Hmm...
The term "world" is a vague descriptor of one's surroundings, but in this context, the "world" refers to the Earth, as in Earth itself. The white as silver world could potentially refer to the Moon itself. The writing here seems to imply that the mountain Kaf refers to the mystical boundary of the universe. Assuming the universe is infinite akin to how various ancient belief systems viewed it, handling Kaf itself would be Tier High 3-A or Low 2-C depending on whether time is counted or not.
Controlling the world's processes is a bit finicky. There doesn't seem to be one single figure for handling all the Earthquakes that take place in the world. One estimate I found is all the earthquakes that took place in the world in the past 110 years would amount to a singular Magnitude 9.95 earthquake:
https://www.usgs.gov/programs/earth...agnitude-energy-release-and-shaking-intensity
I put the magnitude here:
https://earthalabama.com/energy.html#/
Using Total Seismic Moment energy, a Magnitude 9.95 earthquake would amount to a little over 1 yottajoule, which itself is
High 6-B. Could be higher, idk.
I could probably argue the Angel is
5-B since Earth is under his whim from the writing.
So per my guess, anywhere from
High 6-B to
5-B for the Angel's influence over Earth, and
High 3-A or Low 2-C for any influence over the mountain Kaf.