No, boiling doesn't change the shell.
Yes...pumpkins are much harder than cantaloupes because of their stubby stem and cantaloupes do not have a hard shell.
Both contain bone but most turtle shells would be harder than an armadillo's shell.
The shell of a boiled egg is the same strength as a raw egg. Since the egg has been boiled, if its shell is cracked no egg will run out, but the same force will crack the shell.
A hard-boiled egg probably isn't going to dry much more in a low oven than it will at room temperature, and the heat runs the risk of damaging the decoration.
Actually scrambled eggs are more popular than hard boiled eggs and soft boiled eggs. And hard boiled eggs are as popular as soft boiled eggs
An egg that isn't hard boiled would generally break if you bounced it. It's more than likely to break if it is hard boiled.
This is a fairly minor point of usage, but if you say hard boiled eggs you could be interpretted as saying that the eggs are both hard and boiled, when what you really mean is that the eggs were hard-boiled, which is to say, boiled for a longer time than they would be if you wanted soft-boiled eggs. So you can use the hyphen.
Because a hard-cooked egg is considered a potentially hazardous food, they should not be left unrefrigerated for more than 2 hours. Or no more than 1 hour if the ambient temperature is over 90°F.
Gold can be both soft and hard depending on how pure it is, pure gold (24K) is softer than a gold alloy. And the lower the number the harder it is. 10K is harder than 14K, 14K is harder than 18K, and 18K is harder than 24K (pure gold).
harder than metamorphic
harder than my erections
The correct form is "harder." When comparing two things, the comparative form of "hard" is "harder." Adding "more" before "hard" would be redundant and incorrect. So, it is grammatically accurate to say "harder" when comparing the difficulty of two things.