Water by Leeon Vella, 3.02
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Transcript

  • 1. Water
  • 2. Why is water so important?• Water is one of our resources to survive.• We need water to clean dishes, to keepourselves clean, to water plants … and soon.• Without water, the whole planet wouldn’tsurvive.
  • 3. Waters’ historyMillions of years ago, the Earth was just rock and magma.The Earth did not have rain but it had the materials fromvolcanic gases. Hot gases rose in the air and cooled, creatingrain. It rained for days and created oceans and lakes. Fromthere the Earth started.If rain didn’t exist, there would be no life on Earth.The planet needs water as much as we do.
  • 4. How can we get water?• Water comes in different ways, we can getwater from lakes, we can purify it using thereverse-os-mosis.• We can get water from rain, we purify it.• We can also take up water from boreholesstored underground.
  • 5. • Farmers need more water than us .• They need water for watering plants togrow vegetables and fruits, they also needwater to drink and use water for thereeveryday lives.• Most farmers take up water fromboreholes
  • 6. • We can get water from rain.• Rain comes in three types:Relief rainfall, Convection rainfall andFrontal rainfall.
  • 7. Relief rainfall• This type of rainfall comes from themountains.• The warm air rises over mountains, the aircondenses and cools, making rainfall.
  • 8. Convection rainfall• This type of rainfall comes from theground.• The ground is heated by the sun causingthe warm air to rise, when the warm airrises it condenses and rain falls.
  • 9. Frontal rainfall• Frontal or cyclonic rainfall is when a massof warm air meets a mass of cold air.• The point where these two meet is calledthe front.
  • 10. • These types of rainfall are also sources ofwater, the warm air is forced to rise sinceit is lighter than cool air.• This depends on the temperature from thesun and if the sky is cold.
  • 11. The water cycle
  • 12. The water cycle• Water can be in the state of a liquid solid and gas.• Evaporation happens when the warm winds blow over oceans andseas, the water on top evaporates, so the water changes from aliquid to a gas. Evapotranspiration happens when the waterevaporates from trees and plants. The warm air rises andcondenses, this is called condensation, when the water dropletsbecome too heavy to carry, they start to fall to the ground, thisprocess the called precipitation.• The water cycle mostly happens in the form of rain, when it fallsoverland, water runs into streams, rivers and back to the sea to startthe cycle.• The water cycle is also called the Hydrological cycle.
  • 13. Problems involving water• In some countries, there are problems inwater. Some countries have less waterthan others, or some countries suffer fromflooding.• These two problems decrease thepopulation of the country, making it hard tosurvive.
  • 14. Flooding• One of some countries that suffer floodingis Bangldesh.• Bangladesh suffered flooding in1954,1955,1956,1962,1963,1968,1970,1971,1974,1984,1987 and 1988.• The flooding came from both human andnatural causes.
  • 15. Shortage of water• Some countries do not have lakes or rainto get water from, so they suffer completedryness.• To dry and hot countries water is rare.• In these countries water is hard to get,they get it from boreholes.