___ is harder than ___

Keep practicing — related questions

• Hard is to iron as soft is to
• __________ is the hardest substance.
• The hardness of ice is similar to that of concrete.
• The hardness of ice is similar to that of concrete.
• Which of the following substances is the hardest?
• The hardest substance in world is
• Diamond is ______ element.
• Ice packed in _____ does not melt fast.