groundwater surface
71Sinkhole — For the War of 1812 battle, see Battle of the Sink Hole. For the type of wallet, see Wallet band#Swallet. A sink hole in Oman …
72Water purification — This article is about large scale, municipal water purification. For portable/emergency water purification, see portable water purification. For industrial water purification, see deionized water. For distilled water, see distilled water. Water… …
73Water cycle — The Earth s water is always in movement, and the water cycle, also known as the hydrologic cycle, describes the continuous movement of water on, above, and below the surface of the Earth. Since the water cycle is truly a cycle, there is no… …
74cave — cavelike, adj. /kayv/, n., v., caved, caving. n. 1. a hollow in the earth, esp. one opening more or less horizontally into a hill, mountain, etc. 2. a storage cellar, esp. for wine. 3. Eng. Hist. a secession, or a group of seceders, from a… …
75Water distribution on Earth — Contents 1 Distribution of river water 2 Variability of water availability 3 See also …
76Dryland salinity — is salinity that occurs in a landscape that is not irrigated, as distinct from irrigation salinity and urban salinity. Contents 1 Overview 2 Management of Dryland Salinity 2.1 The role of soils in dryland salinity …
77Water supply and sanitation in Saudi Arabia — differs from most other countries in three significant aspects. First, it relies almost exclusively on two sources that are absent in most other countries: desalination and fossil water. Second, given the substantial oil wealth of the country,… …
78Coherence (signal processing) — Contents 1 Background 2 Definition and Formulation 3 Example 4 Extension to non stationary signals 5 …
79Spring (hydrosphere) — On an average day nearly 303 million US gallons (1,150,000 m3) of water issue from Big Spring in Missouri at a rate of 469 cubic feet per second (13.3 m3/s). A spring also known as a rising or resurgence is a component of the hydrosphere.… …
80Natural organic matter — (NOM) is broken down organic matter that comes from plants and animals in the environment. [ Natural Organic Matter, GreenFacts, 22 Apr, 2007 …
