Water is essential to life on Earth. Humans can live for more than month without food, but we can live for only a few days without water . Two kinds of water found on Earth: Fresh water Salt water. Water Resources. The Water Cycle. 71 percent of the Earth’s surface is covered with water,
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Water is essential to life on Earth. Humans can live for more than month without food, but we can live for only a few days without water.
The fresh water we use comes mainly from lakes and rivers and from a relatively narrow zone beneath the Earth’s surface.Global Water Distribution
Surface wateris all the bodies of fresh water, salt water, ice, and snow, that are found above the ground.Surface Water
A river systemis a flowing network of rivers and streams draining a river basin.
An aquifer is a body or rock or sediment that stores groundwater and allows the flow of groundwater.
Porosity is the percentage of the total volume of a rock or sediment that consists of open spaces.
Permeabilityis the ability of a rock or sediment to let fluids pass through it open spaces or pores.
The recharge zone is an area in which water travels downward to become part of an aquifer.