Which of the following is a physical blend of two or more substances with uniform composition? Select all that apply.
Pure substance
O Homogeneous mixture
Heterogeneous mixture
D Solution

Cause of he different elevations  hope this ?

Explosive eruptions are the most hazardous, involving large volumes of tephra and gases emitted from the volcano. lahars, pyroclastic flows, ashfall, and many other volcanic hazards are commonly associated with explosive eruptions. explosive eruptions are very dangerous. basically, any form of hazard can occur.