Singular- "earth's" is singular because its showing ownership
plural- "features" is plural because its saying that there is more than one feature of the earth
Forceful language is language intended to intimidate or forcefully persuade a person with whom you're speaking. It can even include curse words, or can include different intonation elements such as yelling.
It is true that Sonnet 73 is written in iambic pentameter. All of Shakespeare's sonnets are written in iambic pentameters, which means that an unstressed syllable is followed by a stressed one (iambic), and that there are ten syllables in each line (pentameter - penta means 5, meter consists of two syllables).
