earth science 1. Compared to the planet\'s diameter (12,740 km or 7918 mi), the
ID: 1047 • Letter: E
Question
earth science
1. Compared to the planet's diameter (12,740 km or 7918 mi), the atmosphere is like the thin skin of an apple. About 99% of the atmosphere's mass occurs within about 32 km (20 mi) of Earth's surface. Hence, the thickness of the atmosphere represents only about ---- % of the total diameter of the Earth-atmosphere system. [Hint: the atmosphere envelops the planet on both sides.] 2. Together, nitrogen (N2) and oxygen (02) by volume account for ----- % of the gases composing the dry air in the lower atmosphere (below an altitude of 80 km). 3. Up to an altitude of about 80 km (50 mi), the portion of the atmosphere known as the homosphere, the principal atmospheric gases (nitrogen and oxygen) are well mixed and occur almost everywhere in the same relative proportion. Within the homosphere, the proportion of N2 to 02 in dry air is approximately ---- to 1.Explanation / Answer
1.) 0.25 As the atmospheric depth is 30 km/6400 km= 0.5% of earth's radius but dia is double to radius.
2.) 99% N2 (78%) and O2 (21%) so 21+78 = 99
3.) 4-1 nitrogen and oxygen have same relative proportion in atmosphere so
O2 (21%) = N2 (78%)
if O2 (1%) = N2 78/21
= 3.71 After round off
= 4
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