Question

question 32
which of the following correctly describes the angle of repose?
it ranges from 30 - 60 degrees for volcanic lava flows.
it ranges from 5 - 20 degrees for undeformed sedimentary rock.
it ranges from 30 - 45 degrees for unconsolidated sediment.
it ranges from 30 - 60 degrees for folded metamorphic rock.

Explanation:

The angle of repose is the maximum angle at which a granular material can be piled without slumping. For unconsolidated sediment (loose, uncemented particles like sand), it typically ranges from 30 - 45 degrees. Volcanic lava flows are not relevant to the angle of repose concept in this context. Undeformed sedimentary rock is solid and not in a granular, piled state. Folded metamorphic rock is also solid and not applicable to the angle of repose (which is for loose materials).

Answer:

It ranges from 30 - 45 degrees for unconsolidated sediment.