Pyroclastic material is pulverized rock, lava fragments, and ash erupted from a volcano. There are four types of pyroclastic materials namely volcanic bombs, lapilli, volcanic ash, and volcanic blocks. They are commonly associated with Plinian or Krakatoan eruption styles and the phreatomagmatic eruptions.
D. crust and upper mantle
because it is the two uppermost layers that moves the plates to create earthquakes, landslides, etc.
A is wrong because there is another layer in between the two called the upper mantle.
B and C is wrong because they do not contain the crust, the outermost layer of the earth.
The answer is urban areas
