Question

which of the following does the atmosphere not directly provide?
a. the occurrence of sunrises and sunsets
b. our ability to hear and communicate through speech
c. the gases associated with volcanic eruptions
d. surface temperatures conducive to life

Explanation:

Sunrises and sunsets occur due to Earth's rotation and the presence of the atmosphere which scatters light. The atmosphere is needed for sound - waves (used in speech and hearing) to travel as it provides a medium for wave - propagation. The atmosphere also helps in maintaining surface temperatures conducive to life through the greenhouse effect. However, the gases associated with volcanic eruptions come from within the Earth's mantle and are released during volcanic activity, not directly provided by the atmosphere.

Answer:

C. the gases associated with volcanic eruptions