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What is meant by the term "Snowball Earth?" What period of time in the Earth's history does this refer to,and what were conditions like at this time? Support your answer with evidence.
Countershock
(In cardiology) A high-intensity, short-duration, electric shock applied to the area of the heart, resulting in total cardiac depolarization.
Cardiac Depolarization
An event in the cardiac cycle where the heart's muscle cells become electrically charged, leading to muscle contraction and heartbeat.
Mechanical
Pertaining to machinery.
Fifth Intercostal Space
The area between the fifth and sixth ribs, often used as a reference point for certain medical procedures or examinations.
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