Notions (Philosophy) (2) Matter (2) Concepts (2) Conceptos (2) Materia (2) Matière (2) Concept (2) Economic conditions (1) Desk pads (1) Communication (1) Greenhouse gases (1) Primary commodities (1) Male actors (1) Groundwater (1) Waste products (1) Vocation (1) Raw materials (1) Profit (1) Pressure (1) Possibility (1) Pollution (1) Necessity (Philosophy) (1) Investments (1) Inventories (1) Goal (Psychology) (1) Force and energy (1) Fires (1) Face (1) Example (1) Europeans (1)