The Burrow Treptichnus Pedum Marks the Base of

question 19

Multiple Choice

The burrow Treptichnus pedum marks the base of

• A) Lower Ordovician.
• B) Upper Cambrian.
• C) Middle Cambrian.
• D) Lower Cambrian.

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Definitions:

Oxygen Balance

A concept in chemistry that calculates the degree to which an explosive compound can be oxidized, affecting its explosive properties.

Positive

Having a value of more than zero; often refers to electric charge associated with protons.

Oxygen Balance

A concept in chemistry that helps in assessing the degree to which an explosive can be oxidized; it measures the relative amounts of oxygen and combustible elements in a compound.

Explosive

A reactive substance that contains a great amount of potential energy and can produce an explosion when released suddenly, usually accompanied by the generation of light, heat, sound, and pressure.