“Australia is as big as the distance from London to Moscow.” “Australians gulp down an average of 96 liters of beer each year.” “Australia alone produces 1.35 trillion bottles of wine each year.” “If a scarf is woven from the wool produced in Australia in one year, it will be so big that the …
Why the spider doesn’t stick to its own web The spider weaves a web to trap its prey. Small insects get easily caught in this trap. It is very difficult to get rid of these insects. But if you have ever looked closely, you must have found that the spider itself moves easily from one …
A fire occurs when the combustible material comes into contact with enough oxygen in the presence of sufficient heat to enable the chain reaction to run smoothly. The absence of any one of these cannot cause fire. If a fire burns once, that is, a chain reaction is started, it continues to burn and spread …
The atmosphere around the earth is air. It contains molecules of many types of gases and water droplets or steam. The highest among the gases is about 78 percent nitrogen and about 21 percent oxygen. Also there is argon gas and water. It contains dust, ash and salt from sea water etc. We think the …
