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Unit C - Water Systems on Earth. Water, water, everywhere, Nor any drop to drink. Chapter 7-The Water Cycle. 7.1 – WATER IN OUR WORLD. Water Distribution. Water covers 71% of the Earth’s surface . Water Distribution. Most of Earth’s liquid water is salt water in the oceans.

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Unit c water systems on earth

Unit C - Water Systems on Earth

Water, water, everywhere,

Nor any drop to drink.


Chapter 7 the water cycle

Chapter 7-The Water Cycle

7.1 – WATER IN OUR WORLD


Water distribution
Water Distribution

  • Water covers 71% of the Earth’s surface


Water distribution1
Water Distribution

  • Most of Earth’s liquid water is salt water in the oceans.


Water distribution2
Water Distribution

  • Fresh water- is water (liquid, solid or gas) that contains a low concentration of dissolved salts.


Salt water
Salt Water

  • Oceans contain most of the world’s salt water. The salinity of ocean water is about 3.5%

  • Most of the salt in the water comes from land. As fresh water seeps through the soil, it dissolves some of the salt and other minerals we can’t taste the salt yet, but once the runoff (the fresh water going over the land) reaches the oceans it deposits the salt. Over millions of years the salt concentration in the oceans has built up to current levels.


Salt water1
Salt Water

  • Estuaries- are areas where rivers flow into an ocean.

  • Sometimes high tides cause ocean water to flow upstream into the river. This results in salt water mixing with fresh water. This mixed water is saltier than fresh water but fresher than salt water – it is called brackish water.


Fresh water
Fresh Water

  • Canada contains about 9% of the world’s fresh water supply although it only has 0.5% of the world’s population

  • Canada has many wetlands which: help filter and clean the water, and moderate water levels


The three states of matter
The Three States of Matter

  • Water is the only substance on Earth that exist naturally in all three physical states; solid, liquid and gas



The water cycle

Water is always on the move. It is always changing its state and location

The movement of water and its changing of states is known as the Water Cycle- the movement of water as it changes state over, on, and in Earth

The Water Cycle


The water cycle1
The Water Cycle and location


The water cycle2
The Water Cycle and location

  • Heat energy from the sun causes water on Earth’s surface to change to water vapour in a process called Evaporation

  • Water can also evaporate from soil, plants and animals

  • As the air rises it cools. Cool air can not hold as much water as warm air. The cooled water vapour in the air becomes liquid again in a process called Condensation


The water cycle3
The Water Cycle and location

  • Eventually so much water collects as clouds and the wind can no longer keep it aloft (floating). It then falls to Earth as Precipitation

  • Rain, hail, sleet, and snow are examples of precipitation

  • Sometimes snow and ice can turn directly into water vapour in a process called sublimation- change of state where a solid turns directly into a gas without first becoming a liquid


The water cycle4
The Water Cycle and location

  • Liquid water flows along the surface of the ground (Runoff) and gathers in rivers, lakes and oceans

  • Wetlands are important reservoirs of water.


Types of wetlands
Types of Wetlands and location

  • Marsh-low-lying, treeless area of soft wet ground usually covered by water (fresh or salt) for part of the year. Grasses, cattails and other plants grow there.


Types of wetlands1
Types of Wetlands and location

  • Swamp- low-lying, treed area of soft, wet ground covered with water (fresh or salt) for part of the year but contains many trees and bushes


Types of wetlands2
Types of Wetlands and location

  • Bog- is dominated by mosses, which are wetland sponges


Groundwater
Groundwater and location

  • Groundwater is water that has soaked into the soil.

  • It passes through gravel, sand, soil and rock on its way back to rivers, lakes and oceans, or to longer term storage underground


Water
Water and location

  • Water in vapour and liquid form can dissolve many substances.

  • This can be a problem because along with minerals and salts, pollutants and chemicals can also be transported by ground and surface water into lakes and oceans.



The water table
The Water Table and location

  • Water can be “sticky” that is, it shows an attraction to many other materials. This property is called Adhesion – the attractive forces between the particles of a fluid and the particles of another substance.


The water table1
The Water Table and location

  • Water is composed of hydrogen and oxygen. Because of the way the atoms are arranged one end of a water molecule has a positive end and one has a negative end

  • This causes water molecules to act like tiny magnets and forms a cohesive force- the attractive force among particles of the same substance


Water in the ground
Water in the Ground and location

  • When rain hits the ground, gravity causes it to sink. As it sinks, the water dissolves salts and minerals as it moves through the spaces between the soil particles. This process is known as Percolation.


Water in the ground1
Water in the Ground and location

  • As the water continues down through the ground, it eventually reaches a level where it will not go down any further. This is called the impermeable layer. Soil above this layer then becomes saturated with water. This is called the saturated zone.

  • The Upper layer of the Saturated zone is called the water table


Saturated vs unsaturated
Saturated and locationvs Unsaturated


The water table2
The Water Table and location


Factors affecting the water table
Factors Affecting the Water Table and location

  • Amount of rainfall

  • If no little precipitation has fallen the water table can be depleted by capillary action

  • Capillary action happens because water is adhesive and cohesive


Human activities
Human Activities and location

  • In urban areas water percolation does not happen as much as in other areas Why?

  • Urban areas are paved, so precipitation that falls in the city runs directly into the sewers and is emptied into stream and rivers without having a chance to become ground water.



7 5 the power of water1
7.5-The Power of Water and location

  • Sediment – Weathered pieces of rock that can be carried away by erosion


Weathering
Weathering and location

  • Weathering- Weathering is the breaking down of rock into smaller and smaller pieces.


Weathering1
Weathering and location

  • There are different methods by which rocks can be broken into smaller and smaller pieces

    • Mechanical

    • Chemical

    • Biological – can be both physical and biological


Mechanical weathering
Mechanical Weathering and location

  • Mechanical Weathering occurs when rock is physically broken down into smaller pieces. The “new material” is the same as the parent material


Mechanical weathering1
Mechanical Weathering and location

  • Ice Wedging – water gets inside tiny cracks of rocks and freezes. When water freezes it gets about 9% bigger. Over time this will split the rock


Chemical weathering
Chemical Weathering and location

  • Rain water is slightly acidic. Also water can dissolve other chemicals that can react with minerals in the rock causing chemical weathering


Erosion
Erosion and location

  • Erosion is the movement of sediment from its place of origin

  • Erosion can be caused by

    • Gravity

    • Running water

    • Waves

    • Moving ice

    • wind


Erosion1
Erosion and location

  • Sediment gets picked up by rain or running water and eventually finds its way into a river

  • When the water is moving slow enough the sediments will settle to the bottom of the river in a process called DEPOSITION.

  • Heavier sediments settle first while light sediments take longer to be deposited


Erosion2
Erosion and location

  • Over time the deposited sediment can fill in lakes or can build up a delta at the mouth of a river

  • Delta-a flat area of land formed by sediment that has settled at the mouth of a river over many thousands of years



Http www youtube com watch v z7rnyzsh ba

http:// and locationwww.youtube.com/watch?v=z7rNYzSH-BA


What do we do about it brainstorm

-recycle plastic and location-make sure garbage goes to the right place-make strict laws to help minimize waste-Mass clean up to help pick out the trash-Using an alternative to plastic.

What Do We Do about it? Brainstorm


7 6 the human side of water systems1
7.6 – The Human Side of Water Systems and location

  • Earth has a lot of people ( aprox. 6.8 billion) who need water for survival and recreation. Unfortunately our actions have not always have a positive impact on the water supply

  • WATER POLLUTION – any pollution that negatively affects the quality of water


Micro organisms in water
Micro-organisms in Water and location

  • Coliforms (bacteria found in the intestines of animals) can cause a serious health issue.

  • Coliforms can be in high concentrations if raw or improperly treated sewage is discharged into the water.

  • Nausea, vomiting and diarrhea can result


Acid precipitation
Acid Precipitation and location

  • ACID PRECIPITATION – occurs when water vapour reacts with air borne pollutants, like sulfur dioxide and nitric oxide, to form an acid (sulfuric acid and nitric acid)

  • The water then condenses and falls to the Earth as acid rain or snow


Acid precipitation1
Acid Precipitation and location


Acid precipitation2
Acid Precipitation and location



Intake and treatment
Intake and Treatment and location

  • Most of the water used comes from lakes and rivers through a large intake pipe

  • Screens keep out fish and garbage



Water treatment plant
Water Treatment Plant sediments can settle

  • Chemicals (alum) are added to make sediments clump together

  • Water is then forced through layers of sand, gravel and charcoal, which filter out fine sediment

  • Chemicals or UV Light are then added to kill and micro-organisms


Delivery
Delivery sediments can settle

  • In urban areas, water is pumped through large water pipes (mains) and up into a water tower

  • The force of gravity then send water through smaller mains into houses, businesses and institutions


Disposal of waste water
Disposal of Waste Water sediments can settle

  • There are two types of waste water

    • Sanitary Sewage

    • Stormwater


Sanitary sewage
Sanitary Sewage sediments can settle

  • Sanitary Sewage- is water from sinks, baths, washing machines and toilets

  • A service main carries sanitary sewage to a water treatment facility

  • Stormwater- is rainwater and melted snow that runs off streets and the surface of the land


Sewage treatment
Sewage Treatment sediments can settle

  • Solids in sewage are sent to settling tanks. Larger particles settle to the bottom and form sludge.

  • Sludge can be burned, put in a landfill or used as farm fertilizer



  • Effluent is usually treated with chlorine or other chemicals to kill bacteria

  • Make a chain diagram showing the process of Water treatment and disposal


Project coming t his tuesday
Project Coming effluentThis Tuesday!!!

  • Making a Water Filter with simple materials

  • More information about the project will be given Tuesday after the quiz!

  • Performance based!


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