It's likely a term of endearment or affection, meant to convey strength, resilience, or beauty in a unique way. It could be a playful or poetic way to express admiration for the girl's qualities or character.
Why would anyone care!
rocks
Rocks in the sea are typically referred to as "seabed rocks" or simply "underwater rocks." They can also be called "reef formations" or "marine rocks."
What you call molten rock after it has erupted is lava.
rockmantoligost
Pebbles? I think you could call them pebbles.
Pebbles.
"pebbles".
They are called pebbles...
Why would anyone care!
Longshore Drift
rocks
Call the police like anyone else would do?
If a natural disaster occurs it is highly unlikely you would need to call anyone.
Smaller rocks.
Basalt and igneous rocks were formed by what we would call magma/lava
Anyone can call the police on you or anyone else.