I think its 4 hope that helped
A ground source heat pump takes advantage of the naturally occurring difference between the above-ground air temperature and the subsurface soil temperature to move heat in support of end uses such as space heating, space cooling (air conditioning), and even water heating. A ground source or geo exchange system consists of a heat pump connected to a series of buried pipes. One can install the pipes either in horizontal trenches just below the ground surface or in vertical boreholes that go several hundred feet below ground. The heat pump circulates a heat-conveying fluid, sometimes water, through the pipes to move heat from point to point.
this system works during the winter due to it being a sub-ground energy source.
The first satellite in space was named "Sputnik I".
<span>On the date of October 4, 1957, the Soviet Union successfully launched Sputnik I into outer space and it became the world's first artificial satellite. The satellite was about the size of a beach ball weighed only 183 pounds.
I've attached a picture to show you what Sputnik I looked like :)</span>
Answer:
its two plates moving away from each other because of something like an earthquake or a volcano formed so the plates moved etc
hope this helps sorry
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