Brittle
Easily broken
Adhesive
Substance which bonds the surface of materials together
Biodegradable
Materials that can be broken down in the environment by microorganisms
Coniferous
Trees that don’t loose their leaves during autumn
Crude oil
Mixture of hydrocarbons, mainly alkaline formed over millions of years from the remains of ancient dead marine organisms
Deciduous
Tress that lose their leaves during autumn