18. How many total lines of longitude are there? a. 90 b. 180 c 360 d. infinity

Question

18. How many total lines of longitude are there? a. 90 b. 180 c 360 d. infinity are needed in a complete system of International Time? -19. a. 10 As a minimum, how many central or standard meridians b. 15 . 24 d. varies place to place 20. Which of the following is NOT a natural characteristic of the troposphere? a most of the atmospheric water vapor b. the lowest layer of the atmosphere c the highest pressures in the atmosphere d. the hottest temperatures in the atmosphere 21.A equinox has the property of: a. the Sun at the same angle at all latitudes b. 12 hours of daylight and 12 hours of night Cthe vertical rays of the Sun at the Tropic of Cancer d. total darkness north of the Arctic Circle kilogram (s) per square centimeter. ts a force closest to 22, At sea level, the atmosphere exer a. 1 b. 10 . 100 d1000 23. Usualy, the highest relative humidity is a. at dawn b in the evening c. at sunset d. in the late afternoon -24. Most of Earth's atmosphere is the gas: a. carbon dioxide (CO) b. oxygen (O2) c. nitrogen (N) d. hydrogen (H) -25. Earth's overall albedo (reflectivity) has been determined to be approximately this percent. a, 20% b.30% C. 50% d. nearly 0% -26. The main health effect because of ozone depletion in Earth's upper atmosphere will be: a. respiratory problems b. birth defects c. gastro-intestinal cancers d. skin cancers

Explanation / Answer

18 ) C .360

There are 180 longitude lines in the Northern Hemisphere and 180 longitude lines in the Southern Hemisphere.So

a total of 360  longitude lines together.

19) c.24

24 standard meridians of longitude 15o distant from each other are needed in a complete system of international time.

20) d. the hottest temperatures in the atmospshere .

Note : In the troposphere the temperature drops at the rate of 6.5° C /1 kilometer .

21) b . 12 hours of daylight and 12 hours of night  

Note: At equinox length of day = length of night =12 hours

It occurs on

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