Earth's atmosphere has the lowest concentration of which of the following gases?
a. oxygen
b. nitrogen
c. carbon dioxide
d. argon

The correct answer is C - carbon dioxide.

The distribution of gases in the earth's atmosphere is as follows:

1. Nitrogen - 78  %

2. Oxygen - 21 %

3. Argon - 0.93 %

4. Carbon dioxide - 0.038%

Nitrogen, oxygen and argon are permanent gases whose percentage in  the atmosphere does not change from day to day.

Gases such as carbon dioxide, nitrous oxides, methane, and ozone are known as trace gases which make up 0.1% of the atmosphere.

answer: the answer is b

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.