Which one?
Which one is drier, the Sahara Desert or the Atacama Desert?
The Atacama Desert
Busy
busier than / the busiest
Use the comparative form of hot.
This week was hotter than the previous one.
The superlative form of wet is the wetest.
False. It's the wettest.
Which one is smaller, Monaco or the Vatican City?
The Vatican City
Interesting
more interesting than / the most interesting
Use the superlative form of healthy.
Keto diet is the healthiest diet I know.
The comparative form of far can be written as further or farther.
True. Both are correct. According to Cambridge, further is more common.
Which city is further from Río Cuarto, Ushuaia or Rio de Janeiro?
There are 2947 km to Ushuaia and 2385 km to Rio de Janeiro, so Ushuaia is further than Rio de Janeiro.
Bad
worse than / the worst
Use the comparative and superlative form of good.
I think coffee is better than tea, but mate is the best drink ever.
The superlative form of easy is the easiest.
True.