The air around us is a mixture of gases, mainly nitrogen and oxygen, but containing much smaller amounts of water and other gases. Earth's atmosphere is composed of many gases. Their percentages by volume is given by::  78% Nitrogen, 21% Oxygen, 0.9% Argon, and 0.03% Carbon dioxide  And very small percentages of other elements.

Answer: A) 32 Explanation: Let the first number be K and second number be LThen, 2K + 3L = 100.....(1)3K + 2L = 120.......(2)solving (1)&(2), we getK = 32 and L = 12 Hence the largest number is 32.

Answer: D) 1950.50 Explanation: 83% of 2350 = ?   83/100 x 2350   =8.3 x 235   =1950.50

Answer: B) GSMA Asia Mobile Award Explanation:

Answer: A) Stratosphere Explanation: Most of the ozone in the atmosphere is found in the layer of stratosphere, which begins about 10.16 kilometers (6.10 miles) above Earth's surface and extends up to about 50 kilometers (31 miles) altitude.

The electron configuration for Cobalt at ground state would simply be Co: [Ar] 4s23d7. The s,p,d,f configuration for cobalt (Co) is 1s22s22p63s23p64s23d7 , determined by the position of the element on the periodic table. Cobalt is an inner transition metal which means the electron configuration will end in d block. Cobalt is in the 7th column of the d block and therefore has 7 d electrons d7.

Answer: D) Amarinder Singh Explanation:

Adolf Hitler was involved in the Holocaust. The Holocaust, also referred to as the Shoah, was a genocide during World War II in which Nazi Germany, aided by its collaborators, systematically murdered approximately 6 million European Jews, around two-thirds of the Jewish population of Europe, between 1941 and 1945.