Chapter Review:

• Water is essential for all living beings. There can be no life without it.
• The world water day celebrating every year 22 March.
• About 71% of the earth’s surface is covered with water.
• Water exists in three forms: solid, liquid and vapour.
• The groundwater is stored between layers of hard rock below the water table. This is known as an aquifer.
• The rainwater can be used to recharge the groundwater. This is
  referred to as water harvesting or rainwater harvesting.
• A level where all the space between particles of soil and gaps between rocks are filled with water.The upper limit of this layer is called the water table.
• The solid form, snow and ice, is present as ice caps at the poles of the earth.
• Liquid water is present in oceans, lakes, rivers, and even underground.
• The gaseous form is the water vapour present in the air around us.