Which of the following is true of Earth's atmosphere?

Question

Quizplus · Accepted Answer

The ozone layer absorbs harmful ultraviolet radiation, while the ionosphere shields against high-energy particles from the sun.

Answer: A
 Gamma rays and X-rays are able to penetrate Earth's atmosphere, but are absorbed by the ground and can cause harm to living organisms.

Answer: C
 The atmosphere is primarily composed of nitrogen, oxygen, and argon, with smaller amounts of carbon dioxide, neon, helium, methane, and other variable gases.

Answer: D
 The density of the atmosphere decreases as altitude increases, as there is less pressure and fewer molecules in the upper atmosphere.

Which of the Following Is True of Earth's Atmosphere