Fresh surface-water sources, such as rivers and lakes, only constitute about 22,300 cubic miles (93,100 cubic kilometers), which is about 1/150th of one percent of total water. The surface water is held in lakes, rivers, dams, and streams. Although rivers and dams are critical for water supply, they contain only 1% of the freshwater. The rainwater ,groundwater and surface runoff are the source of freshwater. *A. A. They are replenished by the rain and often by rivers and streams, too. Confined aquifers have layers of impermeable material—aquitards—above and below. Pesticides are most likely to be found in runoff from B. A type of aquifer called an unconfined aquifer is a good source of freshwater wells but can become easily contaminated because pollutants can easily flow into the water. Industrial wastes C. Wetlands D. Agricultural chemical in 2. .6% B. Another 30 percent of freshwater is in the ground. There is increasing regional scarcity, though. Others are man made. 12.5% C. 50% D. 99% Subtract the answer from the last question from 100%. What percent of water is not easily accessible or usable on earth? Which of the following is NOT a major source of freshwater pollution? What does the remainder represent and what are the sources of this percentage . Oceans and seas can act as a heat reservoir to regulate climates. Most people have heard Earth referred to as "the water planet." With that name comes the rightful image of a world with plentiful water. Although many people think of ponds, lakes, rivers and streams when thinking about fresh water, many scientists consider wetlands as a freshwater source. Roads C. Farm fields D. Homes E. Factories 3. Another important source of drinking water is the surface freshwater. Related Questions & Answers: The Most Suitable Instrument For Measuring The Size Of An Atom Is: What Is Photolysis: What Is The Oxidation State Exhibited By Boron: When land is quarried, a large basin remains cut away from the earth. Which Is Not A Source Of Fresh Water. Unconfined aquifers are not bound by aquitards. Fresh water is naturally occurring water on Earth's surface in ice sheets, ice caps, glaciers, icebergs, bogs, ponds, lakes, rivers and streams, and underground as groundwater in aquifers and underground streams. Human and animal wastes B. Which is not a source of fresh water? Lakes are still bodies of (usually fresh) water. … biology . In photographs taken from space, we can see that our planet has more water than land. Increased Frequency of Droughts The world’s changing climate has been linked to an increased incidence of droughts that can greatly diminish freshwater supplies in a region. At the current pace, there will not be enough freshwater available to meet global energy needs by 2040. A coastal inlet where fresh and salt water meet. A good example of a man made lake is a quarry lake. Yet, rivers and lakes are the sources of most of the water people use everyday. The water in oceans is saline and not fresh. Alternative waters are sustainable sources of water, not supplied from fresh surface water or groundwater, that offset the demand for freshwater. Alternative water can serve as a vital water supply to federal agencies in support of water resilience by providing diverse water sources. Some lakes are natural lakes, forming in valleys in hilly or mountainous regions. We currently use on the order of 960 cubic miles (4,000 cubic kilometers) of freshwater a year, and overall there's enough water to go around. What is an estuary? Read the passage. A.