Water is life
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Water is essential for life on Earth and covers over 70% of the planet's surface. It exists in three states - solid, liquid, and gas. While water makes up 97% of the Earth's total water, only 0.33% is fresh water available for human and animal consumption, with much of the remaining 2.67% being inaccessible groundwater. The unique properties of water that allow ice to float help sustain life under frozen surfaces.
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The document provides an introduction to hydrology and the hydrological cycle. It notes that over 97% of the Earth's water is found in oceans, while less than 3% is located on land in glaciers, ice caps, groundwater, rivers, lakes, and atmospheric water vapor. The hydrological cycle describes the continuous movement of water on and below the Earth's surface through processes like evaporation, condensation, precipitation, runoff, and groundwater. Water is constantly changing forms through this cycle, whether rapidly or over millions of years.
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The document summarizes key aspects of the global water cycle and distribution of Earth's water resources. It describes that 97% of water is in oceans, with the remaining 3% being freshwater found mainly as ice (69%), groundwater (30%), and a very small amount (0.3%) in rivers and lakes. The hydrologic cycle involves processes like evaporation, transpiration, precipitation, runoff, infiltration and groundwater flow that continuously circulate and redistribute water around the planet. Different precipitation processes are also defined, along with other hydrologic cycle terms like interception, snowmelt, infiltration and evaporation.
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The document discusses the global water cycle and distribution of water on Earth. Most of Earth's water is salt water located in oceans, while only 2% is fresh water found in lakes, rivers, and underground aquifers. The water cycle involves evaporation of water from bodies of water into clouds, which condenses and falls as precipitation back to Earth. Humans have significantly impacted water through use for agriculture, industry, trade, and more, with 2/3 of the population dependent on fish and water used for power generation and transportation.
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The total volume of water on Earth is estimated at 1.386 billion km³ (333 million cubic miles), with 97.5% being salt water and 2.5% being fresh water. Of the fresh water, only 0.3% is in liquid form on the surface. In addition, the lower mantle of inner earth may hold as much as 5 times more water than all surface water combined (all oceans, all lakes, all rivers).
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The document summarizes where Earth's water is located and in what forms it exists. It states that 97% of all water exists as oceans, 3% is freshwater, and 69% of freshwater is locked up as glaciers and icecaps. It also notes that almost all remaining freshwater exists as groundwater below the Earth's surface, and that only 0.3% of freshwater is found in rivers and lakes, yet this is where most water used by humans comes from.
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Water is found in various reservoirs on Earth and is constantly cycling between them through evaporation and precipitation in the water cycle. The largest reservoir is the oceans, which hold about 97.5% of Earth's total water supply. Freshwater makes up only 2.5% and is stored in glaciers, groundwater, lakes, rivers, the atmosphere and soil. The movement and distribution of water between these reservoirs is crucial to sustaining life.
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This document discusses where water is found on Earth, including oceans, seas, lakes, rivers, groundwater, icebergs, and mountain peaks. It explains that most water on Earth's surface is salt water, while only 3% is fresh water. The water cycle is described as the movement and changes of water between oceans, atmosphere and land through evaporation, condensation and precipitation. The document also addresses how humans use water for drinking, hygiene, cooking, cleaning, agriculture and recreation, and provides tips for conserving water such as turning off taps, fixing leaks, and only running full loads of laundry or dishes.
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Water is life
- 2. Water is life World water day is obeserve in every march 22 Earth is the only living planet in the solar system. It is believed that life is originated in water. States of water -Solid -Liquid -Gas
- 4. Three-fourth of the earth’s surface is covered with water. As 71% of the earth’s surface is covered with water, it appears to blue, A pale blue sphere when viewed from the space.
- 5. The sources of water on earth -Oceans -Springs -Rivers -Wells -Pond - Lake
- 6. Ice floats on water due to the decrease in density on freezing. This is why water is seen below the frozen surface of water bodies. Otherwise, the whole water body would have been frozen and all the organisms there would have been dead.
- 7. Fresh water: 0.33% Inaccessible fresh water: 2.67% Saline water: 97%
- 9. The ice accumulated on the mountain and polar regions and the ground water present in some regions are inaccessible to us.