Almost all neuter nouns follow the first of those patterns.
The weak neuter declension contains only a few words - but is included
here for reasons of symmetry.
The nominative and the accusative case forms of neuter words are always the same.
It doesn't matter if it's singular or plural, weak or strong, pronoun, noun or adjective - they're
always the same. This is one of those common Indo-European things. You will encounter the same
in Latin, German, Greek, Sanskrit etc.
Note the u-umlaut in the plural even though there is no u in the ending. The u disappeared
in late Proto-Norse but it caused mutation in its death throes. Proto Norse *landu becomes
Old Norse lönd.
As in the other weak declensions the oblique cases in the singular are all alike!