The Slopes of Most Cinder Cones Are Usually About 30

question 51

Multiple Choice

The slopes of most cinder cones are usually about 30 degrees because _______ .

• A) cinder cones are mostly basalt and basalt is too weak to maintain a slope greater than 30 degrees
• B) the loose materials ejected from the cone form slopes at that angle of repose
• C) they are composites of loose material and lava and the viscosity of the lava requires the slopes to form at about 30 degrees
• D) The statement is false; most cinder cones have slopes less than 10 degrees because of the low viscosity of basalt lava flows.

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