The 'reactivity' of the Land Surface (image) GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre Share Print E-Mail Caption The 'reactivity' of the land surface. If there are more non-weathered mineral grains such as feldspar or mica in the soil, it can react as extensively chemically with little CO2 as an already heavily weathered soil with a lot of CO2. Credit CC-BY 4.0: F. von Blanckenburg, GFZ Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.