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.
Answer this question…Before he proposed his heliocentric theory, most Europeans believed that the sun revolved around Earth.
For the word "difficult, the comparative is more difficult and the superlative is most difficult
comparative - more difficult superlative - most difficult
The most difficult question is the one not spoken.
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.
61. -Vanj
To answer a question we need a what, who, when, where, why or how. Your question needs a when.
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.
Answered this question.
The one that you have asked!
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.
because most of the matter that made of early Earth has been destroyed or changed.
Can you edit the question and make it a little clearer? It is difficult to see what you are really asking about.
Only Depp himself could answer this question.
This is a question one must answer for oneself.