**Containing hydrocarbons**: Composed of carbon and hydrogen atoms.

**Related to fossil fuels**: Pertaining to oil, gas, or coal products.

**Organic compound characteristic**: Describes organic materials with hydrocarbon structures.

**Petroleum-derived substances**: Associated with compounds from petroleum sources.

**Chemical composition descriptor**: Referring specifically to hydrocarbon molecular makeup.

**Environmental impact reference**: Relating to environmental effects of hydrocarbons.