Which of the Following Is the Best Indicator That a Volcano

question 135

Multiple Choice

Which of the following is the best indicator that a volcano might be very dangerous?

• A) gentle slopes that signify fast-flowing lavas
• B) rock analyses that indicate a low content of silica
• C) a volcano that contains andesite and welded tuffs
• D) ages that indicate the volcano last erupted 10 million years ago

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Definitions:

Gram-variable

Refers to bacteria that do not consistently stain as gram-positive or gram-negative because of variability in the structure of their cell wall.

Clostridium Tetani

A bacterium that causes tetanus, characterized by muscle stiffness and convulsions, contracted through wound infections.

Gram-positive

Refers to bacteria that retain the crystal violet stain used in Gram's method of staining, indicative of a thick layer of peptidoglycan in the bacterial cell wall.

Gram-variable

Refers to bacteria that do not consistently stain either Gram-positive or Gram-negative due to certain conditions or characteristics of the cell wall.