Question

Pls help i need to pass this!

Which of these structure types is composed of alternating layers of lava and cinders?

cinder cone
stratovolcano
shield volcano
none of these

The VEI of a volcano’s eruption is based on

the amount of tephra produced.
the height of the eruption cloud.
a descriptive estimate of the explosion.
all of these.

Answer 1

1. Cinder cones

2. All of these

Step-by-step explanation:

1. Cinder cones develop from explosive eruptions of mafic (heavy, dark ferromagnesian) and intermediate lavas and are often found along the flanks of shield volcanoes. The outside of the cone is often inclined at about 30°, the angle of repose (the slope at which the loose cinder can stand in equilibrium).

2. Volcanic Explosivity Index (VEI) is a numeric scale that measures the relative explosivity of historic eruptions. Volume of products, eruption cloud height, and qualitative observations (using terms ranging from "gentle" to "mega-colossal") are used to determine the explosivity value. The Volcanic Explosivity Index (VEI) was derived to catalogue the explosive magnitude of historical eruptions, based on the order of magnitude of erupted mass, and gives a general indication as to the height the eruptive column reached.

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