Consider the following situation carefully: In an uninhabited valley, an earthquake causes movement along a fault line, creating landslides that form a barrier across the valley. A river fills the valley, creating a small lake. The new lake provides a habitat for fish and birds.

By creating the lake ecosystem, what is the earthquake also creating?
A)
a natural disaster
B)
a service function
C)
a catastrophe
D)
a natural hazard