B Types of lightning

　　C Cause of lightning

　　D Differences between thunder and thunderstorm

　　E Frequencies of thunderstorms occurring in the world and the U.S.

　　F Shock waves as thunder

　　5. In most cases of cloud-to-ground lightning， the ground s surface

　　6. One form of lightning that is ball lightning

　　7. Cloud lightning looks like a ribbon when its lighting channel

　　8. Although not fully understanding processes of lightning， man

　　A occurs most infrequently.

　　B is shifted sideways by strong winds.

　　C is often hidden from our view.

　　D is equipped with a good knowledge of various forms of lightning .

　　E is estimated at 20 millions a year.

　　F is positively charged.

　　KEYS： CBFE FABD

　　PASSAGE 19

　　Geology and Health

　　The importance of particular metals in the human diet has been realized within the past few decades， and the idea that geology might be related to health has been recognized for a number of elements such as iodine， zinc and selenium. For example， soils with low iodine contents produce crops， and animals deficient in iodine. A lack of iodine in the human diet leads to some serious diseases.

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