Question

18. Which of the following are not associated with convergent plate margins?
a. deep - focus earthquakes
c. rift valleys
b. island arcs
d. deep - sea trench
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Answer 1

Answer:

rift valleys

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Answer 2

Island arcs are not associated with convergent plate margins.

Explanation:

Deep - focus earthquakes:

• In seismology, a deep-focus earthquake is one that has a hypocenter depth of more than 300 kilometres.

Rift valleys:

• A rift valley is a linear lowland formed by the activity of a geologic rift between numerous highlands or mountain ranges.

Island arc:

• Ocean basins have key structural characteristics such as island arcs and trenches, as well as oceanic ridges.

Deep - sea trench:

• A deep-sea trench, also known as an oceanic trench, is a long, narrow, steep-sided depression in the ocean floor where the highest oceanic depths, ranging from 7,300 to over 11,000 metres, occur.