If an Ash Flow Approaches You from Across a Kilometer-Wide

question 5

Multiple Choice

If an ash flow approaches you from across a kilometer-wide lake,are you likely to be safe or not? Explain why.

• A) Safe. Hot ash flows would chill and stop as soon as they hit cold water.
• B) Safe. Ash flows move along the ground; they would continue harmlessly underwater.
• C) Safe. Hot ash flows would boil the water, and that would stop them.
• D) Not safe. A fast-moving ash flow would cause a deadly tsunami wave.
• E) Not safe. Ash flows can cross much wider bodies of water.

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Definitions:

For Statement

A control flow statement in programming used to execute a sequence of instructions a certain number of times.

Infinite Loop

A loop that never terminates or ends, causing a program to run indefinitely.

For Statement

A loop control statement that repeats a block of code a specified number of times.

Tested Expression

An expression evaluated in conditional statements to decide the flow of execution based on its truthiness.