5 4 In not less than 50 words but not + more than 100 words, explain
how scientific methods is used in examination of documents.​

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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