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1. 
What is Earth geothermal energy?
A.
It is the inner energy
B.
It is the Earth internal heat
C.
It is the internal geological processes
2. 
What is the origin of geothermal energy?
A.
Volcanoes and earthquakes
B.
Heat of impact and compression released during the origin of the Earth by accretion of in-falling meteorites
C.
Decay of naturally radioactive elements
D.
The Earth inner core
3. 
What are the geological phenomena of internal origin?