The ________ of the Earth surface is covered by water.
About ________ of the water in the oceans is salty.
The top layer of soil contains sufficient amount of ________.
Glaciers, rain, lakes, springs and underground water are the sources of ________water.
The water on the Earth is found in ________ states.
Humans retain moisture in the soil and make the soil ________.
________ is the organic matter produced by the decay of vegetables, plants and dead animals.
Major part of the Earth is made up of ________.
About ________ of the water on Earth’s surface is frozen.
On earth, the water is found in:
The lowest layer consists of ________.
The breakdown of rocks by sunshine, severe rains and fast wind blowing is called ________.
Below top layer, a layer of subsoil which contains ________.
The fresh water available to mankind is about ________ of the total water on the Earth’s surface.