form across all rock types and regions, although through different processes. Through these findings and improvements in geophysics, the study of denudation shifted from planation to studying which relationships affect denudation–including uplift, isostasy, lithology, and vegetation–and measuring denudation rates around the world. Measurement Denudation is measured in the wearing down of Earth's surface in inches or centimeters per 1000 years. This rate is intended as an estimate and often assumes uniform erosion, among other things, to simplify calculations. Assumptions made are often only valid for the landscapes being studied. Measurements of denudation over large areas are performed by averaging the rates of subdivisions. Often, no adjustments are made for human impact, which causes the measurements to be inflated. Calculations have suggested soil loss of up to caused by human activity will change previously calculated denudation rates by less than 30%. Denudation rates are usually much lower than the rates of uplift and average orogeny rates can be eight times the maximum average denudation. The only areas at which there could be equal rates of denudation and uplift are active plate margins with an extended period of continuous deformation. Denudation is measured in catchment-scale measurements and can use other erosion measurements, which are generally split into dating and survey methods. Techniques for measuring erosion and denudation include stream load measurement, cosmogenic exposure and burial dating, erosion tracking, topographic measurements, surveying the deposition in reservoirs, landslide mapping, chemical fingerprinting, thermochronology, and analysis of sedimentary records in deposition areas. The most common way of measuring denudation is from stream load measurements taken at gauging stations. The suspended load, bed load, and dissolved load are included in measurements. The weight of the load is converted to volumetric units and the load volume is divided by the area of the watershed above the gauging station. An issue with this method of measurement is the high annual variation in fluvial erosion, which can be up to a factor of five between successive years. An important equation for denudation is the stream power law: , where E is erosion rate, K is the erodibility constant, A is drainage area, S is channel gradient, and m and n are functions that are usually given beforehand or assumed based on the location. Most denudation measurements are based on stream load measurements and analysis of the sediment or the water chemistry. A more recent technique is cosmogenic isotope analysis, which