We need water Flashcards
(15 cards)
How many percent of our body weight is water?
70 percent.
How many days can we live without water?
Three or four days.
How many days can we live without food?
Month or more.
How do we use water?
We drink water, we wash our bodies, our clothes and many other things with water. We use water to flush the toilet, to cook many of our foods, and we use water for leisure activities.
Plants use their ………. to take up water from the soil.
Roots.
Where do farmers bring water from?
Rivers, lakes and wells.
What special kind of watering is called?
Irrigation.
……………… is being irrigated.
Crop of alfalfa in Saudi Arabia.
Why do some industries use water?
To cool hot substances or the moving parts of machinery.
…………….. that burn fuels use water to make steam.
All power stations.
Why do all power stations that burn fuels use water?
To make steam.
Why do hydro-electric power stations the water of fast-flowing rivers is used?
To turn the machines that produce electricity.
How much water does human need per day?
2 litres.
How much water does dairy cow need per day?
135 litres per day.
How much water does large oak tree need per day?
20,000 litres per day.
