Hardwood trees reproduce through seeds containing a covering, while softwood trees reproduce using a naked, uncovered seed. Examples of hardwoods are apple, acorn and hickory trees, whereas softwoods include pine, firs a... More »

Based on the Janka Rating System, which measures the hardness of wood, hickory is the hardest wood and can withstand 1,820 pounds of pressure. The softest hardwood is aspen, which can withstand a pressure of 350 pounds b... More »

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Hardwood comes from deciduous trees with broad leaves that shed their leaves during portions of the year, while softwood comes from conifers that remain green throughout the year and have needles instead of leaves. Hardw... More »

There are several differences between informal and formal observation, with one of the main differences being that informal observation is unstructured and unobtrusive. Additionally, informal observation may also be a pr... More »

Rotation refers to the Earth’s spin around its internal axis, while revolution refers to the Earth’s orbital motion around the sun. The Earth rotates on its axis once every 24 hours and revolves around the sun once every... More »

According to the Boston Globe, the primary difference between bronze and brass is that bronze is made from the combination of copper and tin, while brass is made from copper and zinc. Both are copper alloys, meaning that... More »

Pure science, also called basic or fundamental science, has the goal of expanding knowledge in a particular field, without consideration for the practical or commercial uses of the knowledge. By contrast, applied science... More »