Definition: Aquiferous refers to a type of rock or sediment that holds water in the Earth's crust, which makes it possible for water to flow underground. It is composed of two main layers - the upper layer, known as the permeable matrix, and the lower layer, called the aquifer itself. Water can flow through the permeable matrix when pressure changes, leading to groundwater flow. Aquifers are important in sustaining life on Earth. They provide a stable supply of water that allows ecosystems to survive and thrive by filtering pollutants, supporting plant growth, and providing drinking water for communities.