Question

7 why do gas molecules escape from the exosphere, but not other layers of the atmosphere?
a it is the layer farthest from earth, so there is less gravitational force
b it is the layer in the middle of the atmosphere, so there is higher pressure
c it is the layer where storms form, so winds carry gases away
d it is the layer closest to earth, so the gases dissolve in ocean water

8 why is the sky blue?
a most of the light from the sun is blue
b it reflects the color of the oceans
c blue light is most likely to be scattered by the atmosphere
d blue light is most likely to be absorbed by the atmosphere

9 which statement about temperature and altitude in the atmosphere is true?
a layers closer to the sun are warmer
b layers closer to earth are warmer
c altitude alone does not determine temperature
d the entire atmosphere is the same temperature

Explanation:

Question 7

To solve this, we analyze each option:

• Option A: The exosphere is the outermost layer of the atmosphere, farthest from Earth. Gravitational force decreases with distance, so gas molecules can escape due to less gravity holding them.
• Option B: The exosphere is not the middle layer (middle layers like stratosphere/troposphere are closer), and higher pressure would hold gases, not let them escape.
• Option C: Storms form in the troposphere, not exosphere, so this is incorrect.
• Option D: The exosphere is not the closest layer (troposphere is closest), and gases dissolving in oceans is not related to exosphere gas escape.

So the correct answer is A.

Analyzing each option:

• Option A: Sunlight is a spectrum, not mostly blue.
• Option B: Sky color is not a reflection of oceans (oceans reflect sky in some cases, but sky's blue is due to scattering).
• Option C: Rayleigh scattering causes blue light (shorter wavelength) to scatter more in the atmosphere, making the sky blue.
• Option D: Atmosphere scatters, not absorbs, blue light to make sky blue.

So the correct answer is C.

Analyzing each option:

• Option A: Atmospheric layers' temperature isn't determined by closeness to Sun (e.g., thermosphere is hot but not closest to Sun, mesosphere is cold).
• Option B: Troposphere (closest to Earth) is warm, but stratosphere (above) is warmer than mesosphere, so "layers closer to Earth are warmer" is not always true.
• Option C: Temperature in the atmosphere depends on multiple factors (e.g., composition, solar radiation interaction), so altitude alone doesn't determine it (e.g., stratosphere gets warmer with altitude due to ozone).
• Option D: The atmosphere has different temperature profiles in different layers (troposphere cools with altitude, stratosphere warms, etc.), so it's not the same temperature.

So the correct answer is C.

Answer:

A. It is the layer farthest from Earth, so there is less gravitational force

Question 8