Which one of the following statements concerning volcanic blocks and bombs is true?
A) Blocks are broken fragments of solid rocks; bombs have smaller sizes than lapilli.
B) Bombs and blocks are both smaller than lapilli and cinders.
C) Bombs are guided to Earth by laser beams; blocks fall anywhere.
D) Bombs are ejected as magma lumps; blocks are ejected as solid fragments.

Question

Quizplus · Accepted Answer

Bombs are ejected from a volcano in a molten or semi-molten state (as lumps of magma) and solidify into streamlined shapes as they fly through the air, whereas blocks are already solid when they are ejected, being fragments of solid rock from the volcano or its surroundings.

Which One of the Following Statements Concerning Volcanic Blocks and Bombs