1. Experiment on black absorbing heat:
Take two bottles paint one black then add water and put two tea bags leave for six hours outside. The one painted black brews tea faster than the other.
2. Flours are made from grinded wheat
3. Source of electricity are sun, turbine or steam engine.
4. Make a needle magnetic by stroking it 50 times in one direction on a magnet.
5. Cassete and video tapes use magnetism to record sound.
6. Electricity has magnet. When you wound a wire around a tube or nail, it acts like a magnet. This metalic tube wounded by wire is called electromagnetic.
7. Light and sound travels in a wave like manner or they travel through waves.
8. Periscope can be used to see above crowd. Use this concept in stadium, bar or places where you wish to see behind people.
9. If it rains when the sun is shining, you will see the rainbow. Because the water droplet separates the sunlight into various color.
10. cotton is from the seed pod of cotton plant and wool is from sheep or animals
11. Air is mostly made of Nitrogen 78%, oxygen 21%, carbon 0.03, argon and other gases 0.97
12. Plastics are artificial materials made from chemicals found in oil. By heating it and making it to solidify
13. Rubber is made from a whitish fluid called latex found in rubber trees. Then the acid - vinegar is added to solidify it. Rubbers are used to make tyres because they dont slip easily even on smooth surfaces.
14. some fibres (thread) are natural (from plant and animal) while others are artificial (made from oil and coal)
15. Nylon is made from chemicals in oil.
16. You can make cloth or a material waterproof by adding candle wax.
17. Glass is made from sand. That is beach sand is heated with limestone until they melt and mix together.
18. Metals rust (decompose and brownish). Wood rots (fungi grows on it and becomes soft)
20. Gold is called the noble metal because it is the only metal that does not rust even when buried for hundreds of years.
21. Lukewarm water is boiled water allowed to cool.
22. Since rain forest trees are reducing, human will soon go paperless (we will stop using paper)
23. The fastest growing tree is Eucalyptus tree.
24. Countries at the equator or middle of the earth are warmer than countries at the pole or edge of the earth. This is because the sun rays heats the center more than the sides.
25. Clouds are formed when warm and cold air meet.
26. All the evaporated water form cloud and when they become too much, they fall down as rain. If the air is below freezing point, these air or water vapor in the cloud solidify and fall as snow.
27. green house is trapped chemicals in the atmosphere and acid rain is when rain falls and mix with these toxic chemicals. This is why you should not allow first droplets of rain fall on you since they are more toxic as a result of acid rain.
28. Do you know some plants give natural sign to show it is going to rain soon example is Seaweeds.
29. the biggest ocean is pacific ocean. And the longest river is River Nile.
30. Experiment to see if sun evaporates water: Mark a puddle with chalk then go back after an hour of sunshine to see if water has reduced.
31. Glaciers are rivers of ice.
32. There are 5 oceans in the world: The Arctic, Atlantic, Pacific, Indian and Southern (Antarctic) ocean.
33. In other to make a map, two things are important the distance and angle between each objects. Surveyors use Map bearings to find the angle.
34. We can find a place by using imaginary lines called line of longitude and latitude.
Lines of longitude are lines that runs from top to bottom of the globe. They are measured east or west of the line in the middle called 'Greenwich'
Lines of latitude are lines that runs parallel to the globe. It is measured north or south of the equator (equator is the middle line accross the earth or globe or a line that circles the earth middle)
Great Meridian: the 0° longitude on the globe is the great meridian. It can be seen in Greenwich (a place in England). Every place in the world that lies on this line has the same time called Greenwich Mean time (GMT). Every 15° east or west the time changes. If in the east it is behind and in the west it is ahead.
38. Not all waste are pollution but the harmful ones that do not decompose is called pollution.
39. The greatest way to protect our environment is to cut down the harmful waste we are producing.
40. Algal bloom occurs when fertilizer from farmland or waste from factories drain to rivers thereby forming thick green blanket of algae on the surface of the river and which eventually lead to death of all fishes in that river.
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