The correct answer is:
The only similarity is that they are both glacier and geyser made of water.
The explanation:
1- geyser:
A geyser is a natural phenomenon that features a gushing fountain of water and/or steam being emitted from a hole in the ground. Such eruptions often occur on a periodic basis
2- A glacier:
is a huge lump of water ice and nothing more. If a glacier melted fast enough it would become a river.
So, both of them made of water.
