Do hardwoods have leaves or needles?

Why types of wood come from coniferous trees?

Why do softwoods tend to be cheaper than hardwoods?

Pine can be used for ..

Ferrous metals contain?

Are ferrous metals magnetic?

Will non-ferrous metals rust?

For the same sized piece of steel and aluminium, which would be heavier?

Polymers mostly come from?

Which plastic can only be formed once?

Which polymer will soften when heated and harden when cooled?