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Mercury's scarps,numerous long cliffs,were probably formed as the planet cooled and contracted.
Mitral Valve
A valve in the heart that lies between the left atrium and left ventricle, which ensures one-way flow of blood from the atrium to the ventricle.
Valves
Mechanical or biological devices designed to regulate the flow of fluids by opening, closing, or partially obstructing passageways.
Sequence
A specific order in which related events, movements, or things follow each other.
Carbon Monoxide Detector
A device that detects the presence of carbon monoxide gas in the air to prevent carbon monoxide poisoning.
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