I would say that, at least in Pure Mathematics, the most challenging field in the past few years it's a sort of mathematical grand unification project, that goes by the name of "Langlands Program"; this has generated a fair amount of Fields medals in recent years, and aims to unify Number Theory, Algebraic Geometry, Arithmetic Geometry, Group Representations and a few more subjects under a common framework.
more difficult, most difficult
More difficult and most difficult. With a word that long we don't generally add the -er or -est suffixes.
For the word "difficult, the comparative is more difficult and the superlative is most difficult
Answer this question…Before he proposed his heliocentric theory, most Europeans believed that the sun revolved around Earth.
comparative - more difficult superlative - most difficult
The most difficult question is the one not spoken.
The most asked question in the universe is difficult to pinpoint definitively. However, common contenders include: "What is the meaning of life?", "Is there intelligent life beyond Earth?", and "What happens after we die?"
61. -Vanj
This is a philosophical and religious question that is difficult to answer in a subjuctive manner. A biblical interpretation of this question is that god created the earth in seven days.
To answer a question we need a what, who, when, where, why or how. Your question needs a when.
Answered this question.
The one that you have asked!
Your question is not clear and it is difficult to understand. However the earth's magnetization is not affected by rotation or the full moon.
It is not possible to answer this question because people find different things easy or difficult. What you find easy I might find difficult, and conversely.
Only Depp himself could answer this question.
This is a question one must answer for oneself.
Can you edit the question and make it a little clearer? It is difficult to see what you are really asking about.