1.Climate and Life on Earth 2.Penguins in Antarctica 3.Extinction of Big Ice Age Mammals 4.Calculating the Threat of Tsunami 5.Tornado 6.Relationship among Chimpanzees 7.Save Endangered Animals by Cloning 8.Estivators 9.Seahorse Fathers Take Reins in Childbirth 10.Elephants May "Talk" via Vibration 11.Life Is Confusing for Two-headed Snakes 12.Studying Tree Rings Helps to Understand the History 13.Who Were the Inca? 14.Early Humans' Tolerance of Various Climate Conditions 15.Maya Civilization 16.Qomolangma Melting? 17.Raw Human Waste Killing Off Coral Reefs? 18.Frog Deformities 19.Bright Side of Wildfires 20.Noise Pollution 21.The Production of the Sun's Light and Heat 22.Eclipse 23.Is a Large Asteroid Headed for Impact with Earth in 2880? 24.Inner Earth May Hold More Water than the Seas 25.Are Volcanic Eruptions Tied to Lunar Cycle? 26.Time Travel 27.Sea Water 28.Change in Oceanic Salinity 29.Slaughter the Most Efficient Way to Control Epidemic 30.What Causes Heart Diseases 31.What Causes Cancer 32.Hydatids-When a Dog Is Not Man's Best Friend 33.Drugs in Sport …… Answer Key Vocabulary
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