The north american laurentian great lakes, for example, hold nearly 20% of the earths accessible surface fresh water supply. Ask them what they think the blue parts of the globe indicate. A drop in your cup 2teacher and youth education, 2015 sources like lakes, rivers, and swamps. About 71 percent of the earths surface is watercovered, and the oceans hold about 96. The replenishment of freshwater depends on evaporation from the surface of the oceans. All living things require water to grow and reproduce. Because the oceans that cover roughly 71% of the area of the earth reflect blue light, the earth appears blue from space, and is often referred to as the blue planet and the pale blue dot. Hidden water trapped in different forms such as in polar ice caps and glaciers is another important source of water.
Some sources of surface water are also fed by underground aquifers. Nearly threefourths of the earth s surface is covered with water. Pollution sources water becomes polluted when foreign substances enter the. Tell them that most of the earth is covered with water, shown on the globe as blue. The more data we collect, the more dynamic our early solar system appears. Apr 18, 2020 these frozen water sources can affect the sea levels. The water available to planet earth is the same water that has always been available and the only water that ever will be available. About 71 percent of the earth s surface is water covered, and the oceans hold about 96.
As soon as students have all the supplies needed for the investigation, i ask the teams to begin reading and following the directions on the the distribution of water on earth investigation. Knowing about some of the planets water sources gives you some insight about this blue planet. Feb 01, 2016 sources of drinking water on earth by. Sources of water pollution school of ocean and earth. Although ocean water makes up nearly 97 percent of all water on earth, it is not a viable source of. The contamination could be caused by physical debris such as plastic water bottles or rubber tires, or it could be chemical such as the runoff that finds its way into waterways from factories, farms, cities, cars, sewage treatment facilities, and air pollution. These frozen water sources can affect the sea levels. A positive feedback system that affects earths temperature is the feedback loop. The bodies of all plants and animals contain water. Much of this available water is located far from human populations, further complicating issues of water use. Organic pollution human sewage, animal waste, and plant residue also contain organic material, which can pollute water. Tell them that most of the earth is covered with water, shown on the.
Water cycle national oceanic and atmospheric administration. Pdf on jan 1, 2016, asha gupta and others published water pollutionsources,effects and control find, read and cite all the research you need on researchgate. Surface water accounts for 80 percent of the water humans use. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog. Pdf on jan 1, 2016, asha gupta and others published water pollution sources,effects and control find, read and cite all the research you need on researchgate. Students learn to identify water sources and go on a hunt to see where and how water is used around the school. But just how much water exists on, in, and above our planet. The origin of water on earth francois robert science 293. Water pollution occurs when a body of water becomes contaminated. Teach about the properties of water, the water cycle, and the sources of water on earth with these illustrated notes. Sources of surface water can include any aboveground collection of water such as rivers, lakes, ponds and oceans.
Water pollution occurs any time that contaminants are discharged. Precipitation such as rainfall, snow, hail and sleet. There are more than 5 sources of water and the conventional sources are listed first. Natural sources of water powerpoint bring the outdoors inside your classroom with this natural sources of water powerpoint. Rethinking the source of earths water earth, with its blue hue visible from space, is known for its abundant water predominately locked in oceans that may have come from an. About water 97% of the water on the earth is salt water. A positive feedback system that affects earths temperature is the feedback loop between carbon dioxide and water vapor. Nearly threefourths of the earths surface is covered with water. The above are some of the factors or causes of groundwater pollution. Youve heard the phrase, and for water, it really is true. Sources and effects of groundwater pollution earth eclipse. Water can be found in fresh water bodies, such as lakes, rivers, and groundwater, as well coastal water bodies and oceans 1. Bring the outdoors inside your classroom with this natural sources of water powerpoint.
I especially like a cool drink of water by barbara kerley because it has vivid photographs. Uses of water include agricultural, industrial, household, recreational and environmental activities. Overview of water supply sources this is the first in a series of fact sheets regarding sources of drinking water supply commonly used in new hampshire. Therefore, in this article, you are going to understand more about groundwater pollution, causes or sources, and effects. Details of whether comets like hartley 2 could have delivered a large proportion of water to early earth still need to be settled.
Surface water is water which is not closed to atmosphere and outcomes from overland flow. The two types of water supply sources, surface water and groundwater sources, are described within. Water resources are sources of water that are useful or potentially useful to humans. The north american laurentian great lakes, for example, hold nearly 20% of the earth s accessible surface fresh water supply. Soils and groundwaters contain the residue of human agricultural practices fertilizers, pesticides, etc and improperly disposed of industrial wastes. Sep 20, 2017 download sources of water ppt power point presentation pdf. Rethinking the source of earths water universe today. This is because most of the water used by us is found in the ground. Natural sources of water powerpoint with images science. That leaves only one percent of the earths water available to us for our daily water supply needs. If wide scale melting occurred, earths water levels would increase and the land area would decrease. Water resources are natural resources of water that are potentially useful. Indirect sources include contaminants that enter the water supply from soilsgroundwater systems and from the atmosphere via rain water. Download sources of water ppt power point presentation pdf.
Earths waters dh ratio is wellmatched by carbonaceous chondrite meteorites see section 1. Most fresh water exists as glacial ice or is trapped underground see charts. Over 97 percent of the earths water is found in the oceans as salt water. It is commonly believed that at different points in history, when the climates were different, the levels of the various sources of water were also different. Describe a positive feedback system that affects earths temperature. Many uses of water include agricultural, industrial. Reactor concepts manual natural and manmade radiation sources usnrc technical training center 61 0703 natural and manmade radiation sources all living creatures, from the beginning of time, have been, and are still being, exposed to radiation. Rivers are formed along more or less defined channels. For an estimated explanation of where earth s water exists, look at this. In this essay i explore, through herodotus histories, the ways in which the life and culture of a people finds its source and substance in their relationship with the natural environment as well as how the geographical distribution of cultures makes. The pebble snow model would thus invoke carbonaceous pebbles as the source of earths water, delivered late enough that the disk had cooled to the point. The drive continues to understand all the possible sources of earths water. The ratio of deuterium a heavier hydrogen isotope to normal hydrogen is a unique chemical signature in various water sources.
It is important because it is needed for life to exist. The terrestrial water must therefore have been imported from the coldest regions of the. Bacteria in the water decompose the organic material, producing. Water, which covers around 70 percent of the earths surface, comes in the forms of freshwater and saltwater. Water is also important for human activities and the production of. Read this article to learn about the two important sources of water, i. If the dams are to be higher than a few metres it is recommended that community members ask specialized engineers to design the dams. Sources of water water distribution environment science. Water, which covers around 70 percent of the earth s surface, comes in the forms of freshwater and saltwater. Sketching, doodling, or coloring notes gives students an opportunity to. Three possible sources of water on the earth have been proposed so far.
Our oceans and seas are, combined, very much the largest water source on earth. The drive continues to understand all the possible sources of earth s water. In its three phases solid, liquid, and gas, water ties together the major parts of the earths climate system air, clouds, the ocean, lakes, vegetation, snowpack, and glaciers offsite link. The worlds water exists naturally in different forms and locations. There is a small finite upper bound on the amount of easily accessible water in nearearth space, including water from ctype neas and permanently shadowed lunar craters. Show students the word water on the water idea web. Rainwater, oceans, rivers, lakes, streams, ponds and springs. Because water covers threequarters of the earths surface, it might appear that there is plenty to go around. It can be found all over the world, in virtually every region no matter how dry it may appear. I purposefully encourage the students to independently make sense of the directions as this is an important skill to learn at the 5th grade level. Even though most community drinking water especially from surface water sources is treated before entering the home, the cost of this treatment and the risks to public health can be reduced by protecting source water from contamination. The water cycle shows the continuous movement of water within the earth and atmosphere.
Most water in the earths atmosphere and crust comes from the world oceans saline seawater, while freshwater accounts for only 2. For an estimated explanation of where earths water exists, look at this. Again, lakes have long provided humans with a source of drinking and washing water. Jeffrey taylor hawaii institute of geophysics and planetology a major mystery in planetary science is the origin of earth s water. Most water in the earth s atmosphere and crust comes from the world oceans saline seawater, while freshwater accounts for only 2. Two percent of the earths water is stored as fresh water in glaciers, ice caps, and snowy mountain ranges.
Refer to additional fact sheets from the new hampshire department of environmental. The remaining unfrozen freshwater is found mainly as groundwater, with only a small fraction present above ground or in the air. When land is quarried, a large basin remains cut away from the earth. In the case of earths oceans, the deuteriumtohydrogen. Mostly in hilly or mountainous regions where other water sources are scarce. Precipitation precipitation such as rainfall, snow, hail and sleet is one of the major natural water sources in the world. Guided graphic notes are a great way to help your students make associations between words and visual images. The water resources of the midwestern united states, and how they are managed under a future climate, have a significant collective impact on multiple economic sectors in the us, north america, and the world.
256 1513 1368 663 1303 1170 1145 1143 1360 1528 1503 348 961 1508 502 1424 291 1058 474 463 216 1368 1158 806 170 1079 335 527 340