The air above earth’s surface is at different temperatures. what is responsible for this difference in temperature?
the moon
the sun
landforms
earth’s rotation

The correct answer is B. The sun.

Explanation

The sun is responsible for the air of the earth's surface having different temperatures because the sun's rays penetrate the earth's surface with different angles, for example, in the middle zones the rays enter directly, while in the polar zones the rays enter with less intensity through the angle into which the atmosphere penetrates. Besides this, these rays and especially the ultraviolet radiation leads to differences in the Earth atmosphere that made the termosphere have the highest temperature due to ultraviolet radiation while the temperature decreases in other layers. So, the correct anwer is B. The sun.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally