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• Pesticides

• Phytoplankton

• Propulsion and Thruster

• Polar Orbit

• Physical Components of Remote Sensing

• Passive Sensor

• Perpendicular Vegetation Index (PVI)

• Pixel-Based Classification

• Planetary Science

• Phthalates

• Panchromatic Imagery

• Pollutant

• Pollution

• Persistent organic pollutant (POP)

• Point source pollution

• Purification

• Potential evaporation

• Potential evapotranspiration

• Peak flow

• Plane flow

• Precipitation

• Pond

• Percolation

• Permeability

• Permeable

• Porosity

• Permafrost

• Pumping water level

• pH

• Power Cycles

• Pressure-Fed Cycle

• Propellant

• Policy and legal related aspects of Water

• Pipe leaks

• Physical

• Phosphorus cycle

• Perched groundwater

• Phreatic groundwater

• Perseverance

• Piezometer

• Precipitation monitoring

• Palmer Drought Severity Index (PDSI)

• Priestley and Taylor approach

• Penman-Monteith equation

• Precipitation over land

• Precipitation over ocean

• Pool

• Pediment

• Pediplain

• Percolation tank