sentence: Ironwoods are so dense that they sink in water rather than float as other woods do.
sentences_before: Hardwoods normally have broad leaves and come from deciduous or broad-leafed evergreen trees. Hardwoods grow slower than softwoods. Evergreen softwoods grow faster than deciduous hardwoods, and can grow to a larger size. Hardwoods are excellent for carving. One of the hardest hardwoods is black ironwood which is recognized by the Guinness Book of World Records as the heaviest wood.
concept_name: ironwood
headings: Hardwood Properties
categories: Wood