Temperature and Smell   Materials Required: Paper towel Perfume Refrigerator A molecule is the smallest particle of a substance, made up of one or more atoms held together by a force. When heated they move faster, than they would, if cold. As the temperature increases, more molecules escape and travel into the air. This indicates that perfumed molecules can be smelled more easily, when you put some on your warm skin....

Soil an Invaluable Resource One of the Earth’s most valuable basic resource is the soil. It is formed of several layers of ‘Humus’, made of decaying leaves etc. It covers the first layer of soil called the ‘Topsoil’. In this layer decayed plant and animal material is broken down by bacteria, insects and earthworms thus making it fertile. Below this lies the ‘Subsoil’ containing lesser organic material and reachable only by...

Preventing Soil Erosion Materials Required: A large pitcher Four cookie trays, about 1.8 inches (45 cm) wide Soil with grass growing in it Measuring cup 5. Water A swale is a low area, covered with grass or plants. Water runs through it. The plants prevent soil erosion. Rushing water can cause soil erosion, but the roots of grasses and plants help the soil from being washed away. By performing the following...

Tracking the Insects Materials Required: An adult Small paintbrush from a craft or toy paint set White paint, the kind used for modeling A board that has been on the ground, since long A strong stick Rubber gloves Have you ever lifted an old board lying on the ground and seen some tiny animals(beetles, worm etc.) crawling under it? Is this their home or are they just passing by? If it...

Foods that Retain Heat Materials Required: An adult to make pancakes Stove Utensils Pancake mix Milk Margarine Two Dinner plates Ever wondered, why certain food cools faster than others? A potato stays hot for long while a toast doesn’t. Assuming, thick food retains its warmth for a longer period of time, a thicker pancake should keep its heat longer than a thinner one. With the help of an adult, carry out...

Switching Places Materials Required: A hair dryer Two Ping-Pong balls Place a hair dryer in such a way on the floor, that the hot air is turned towards the ceiling. Now if you put two Ping-Pong balls in the blast of air, they will hang in the air stream, as is shown in the illustration below. Pick up the ball which is higher. Hold it high, and let it go into...