Volcanic eruptions destroy buildings and productive land, and ...

[lindiwe]

Volcanic eruptions destroy buildings and productive land, and cause injuries and fatalities to life. Why, then, is volcanism considered a constructive process?

Question 2

What do cyclothems represent?
 A)volcanism
 B)evaporation
 C)transgressive and regressive cycles
 D)transgression only
 E)regression only

[Benayers]

Answer to Question 1

Volcanic emissions played an important role in the origin and evolution of the atmosphere and hydrosphere. The continents are composed in part of volcanic and plutonic rocks, and oceanic crust is produced igneous activity. In addition, weathering of lava flows, pyroclastic materials and volcanic mudflows converts them to productive soils.

Answer to Question 2

C

[lindiwe]

YES! Correct, THANKS for helping me on my review

[alvinum]

Gracias!