Answer:
the pronoun is they
Explanation:
it's they because the sentence doesn't specifically say who 'they' is.
Answer:
Geologists admit that predicting geysers with complete accuracy is not possible.
Explanation:
Geysers are very fickle because it is not yet possible for geologists to accurately predict their functioning, with the exception of the Old Faithful geyser.
As you may already know, geysers function as a volcanic activity, however expelling jets of water and not lava. These water jets are caused when the pressure of the groundwater increases to the point of overcoming the pressure of the water column, the result of which is the high expansion of the groundwater that causes their expulsion to the surface.
