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• Groundwater is water that is found in the pores and spaces between soil particles.
• Groundwater contains about 0.3 percent of the total water on earth

• After a rain event, water can runoff, evaporate or *infiltrate* into the ground

• The amount of pore space in a material

• The ability of a material to let water pass through it

• Aquifers
  • Saturated underground layer