human
What are the differences between the different types of wood?
assistant
The main difference between different types of wood is in their density, grain structure and color. Density refers to how much mass a piece of wood has per unit volume; denser woods like oak have more mass than lighter-weight woods such as pine. Grain structure refers to the way that the wood cells are arranged within the material; some woods have straight grain patterns while others can be more curly or wavy. Color can also vary depending on the type of tree from which the wood was cut; light colored woods like pine tend to be softer and easier to work with, whereas darker woods like cherry can be harder and more durable.