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Holding water in a sieve
Pour some oil over the wire mesh of a kitchen sieve and shake out the overload so that the holes are open. Cautiously pour water into the sieve from a pitcher, letting the water run down the side of the sieve. When the sieve is about half full, hold it over a sink or pail and observes the bottom. You will see the water pushing by the openings but the surface tension keeps it from running by. Touch the bottom of the sieve with your finger and the water should run by.
How to prevent the erosion of topsoil Use the trays constructed for the experience above. (a) Fill the trays with loose soil and tilt everyone the similar amount. Make furr
Rejection of Heliocentrism: This happened in the year 1918 when the astronomer Harlow Shapley (1885-1972) first surveyed the size and shape of the Milky Way Galaxy. He sh
Under what conditions an element is called an essential element? An element is called as an essential element, if: a. The plant can not complete its life cycle without it
An experiment with a bottle and cork Tightly close a liitle bottle with a cork or rubber stopper. Place the bottle in the receiver and remove some of the air with the pump.
write 2 kinds of energy sources
Procedure 1 . After the dissection experiment is over the dead animals are put in disposable paper bags and the bag is sealed. Animal tissues and excreta should also be put and
Q.How are clouds formed? During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also r
father of environmental microbiology
Night Sky: When you look up at the sky on a clear night, what do you-see? Most of it is dotted with twinkling stars. You may see the moon or Venus as a bright point or Mars as
what are the condition necessary for heat transfer to occur?
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