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Geocentric Universe of the Ancients:
The earliest ideas of the Egyptians and Sumerians about the universe may seem strangeto us. The Earth appeared flat 2nd solid tg them. The Sumerians visualised the universe as a flaEarth covered by the heaven made up of tin! Between them lay the glowing Sun, Moonplanets and stars which were conuolled by the gods. The Earth was obviously the principal thing in the universe. Indeed, they knew no reason to think otherwise. They accepted the Sun, Moon, planets and stars for what they looked like.
The Earth is Round:
The idea of a flat Earth was discarded by the Greeks. As early as 600 B.C.; the philosopher Thales thought the Earth to be round. Pythagoras and his disciples also
maintained that the Earth was spherical. They reasoned that it must be round becauseof the way ships seemed to sink below the horizon of he sea (Fig.) or because of the circular shadow it cast on the Moon during an eclipse
INTRODUCTION : In this unit, we introduce you to the fundamental of personal safety code in a laboratory. If you do not have safe laboratory practice, your life and those of your
Explain the term- lichens The lichens are able to extract nutrients from the rocks . They are capable of retaining water for a long time during which chemical processes take p
Pantothenic acid (vitamin B5) Pantothenic acid, also known as vitamin B5, is essential to all forms of life. Pure pantothenic acid was first isolated as its calcium salt
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Homo Habilis-The First Tool Makers: One of the most important developments in human evolution was the dramatic expansion in brain size which, according to the fossil data
Explain How tongue can sense different tastes? Our tongue can sense different tastes. Do you know which are the basic tastes and the areas where these are sensed? In humans, th
would sandstone or quartzite break easier?
Explain the Process of Filtration - Formation of Urine The kidneys form urine in three phases: simple filtration, selective re-absorption and secretion. Let us begin with the p
Demonstrating an eclipse of the moon Use a flash light or a lighted candle in a darkened room to show the sun. Hold an 8 cm rubber ball in one hand to show the earth. Hold a 2-
Jupiter Jupiter is the largest planet of the Solar System. If Earth were placed on the face of Jupiter, it would look like a 50 paise coin on a dinner plate. It weighs mor
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