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Man breath by drawing air into his lungs (inhaling) and letting it out again (exhaling). In breathing, a fresh supply of air is brought into contact in the lung with tissue very rich in blood. In the lung, gases are exchanged between blood and the air. The lungs are large, soft organs, which both sides of the chest cavity. The lung tissue is like a fine sponge in some ways.
About 180 million years ago the reptiles ruled the earth. In fact, there were so many of them and they were so powerful, that this period is known as the Era of Reptiles. The scientific name for this period is Mesozoic Era. The largest of all the reptiles were the dinosaurs. And the largest dinosaurs were probably the biggest animals that ever walked the earth! Yet about 60 million years ago the dinosaurs died out because changing conditions made life impossible for them.
About 1,200 years ago there was a group of people, the Norsemen, who came from the coastal regions of Norway, Sweden, and Denmark. Their name “viking” was probably taken from the viks, or sounds, of their home region. The vikings were great sailors and adventurers. They were strong and sturdy, often with blue eyes and fair hair. At a time when the rest of Europe was terrified to sail the sea, the vikings were great explorers and traders.
Imagine how hard it would be to tell in words the exact location of all the streets and buildings in your town. It would be simpler to make a picture or diagram of the location of such objects. The result would be a map! The first map we have any record of was modeled in clay and then baked more than 4,000 years ago, in Egypt. In ancient times, landowners marked the outlines of their land, and kings, the boundaries of their kingdom on maps.
colorless gas with a very strong odor. In fact, breathing in too much ammonia may cause death. Ammonia gets its name from the discovery of a certain compound, ammonium chloride, near the Temple of Jupiter Ammon in Egypt.
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