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My mother is the sea and sky, my father's of the earth,
When those two come together, all but destined is my birth,
I grow so much larger than the substance I consume,
To one of the avengers, my existence could spell doom,
I could spread like pox across the surface of a giant,
The giant might then wish that his skin was a bit more pliant.
What am I?
Are you perhaps
Rust?
My mother is the sea and sky, my father's of the earth,
When those two come together, all but destined is my birth,
Rust comes from iron (earth) and the oxygen (sky)... can be fuelled by moisture (sea).
I grow so much larger than the substance I consume,
To one of the avengers, my existence could spell doom,
Rust 'consumes' iron, would definitely be harmful to iron man.
I could spread like pox across the surface of a giant,
The giant might then wish that his skin was a bit more pliant.
Rust occurs on even the biggest iron objects, such as a ship.
Science tag:
Rust is general knowledge, though it is written as a chemical equation and studied as such.
Could the answer be clouds aswell.
My mother is the sea and sky, my father's of the earth, When those two come together, all but destined is my birth,
earth, sea and sky are all involved in cloud formation or birth.
I grow so much larger than the substance I consume,
Clouds are less dense than water.
To one of the avengers, my existence could spell doom,
First test with iron man's suit
I could spread like pox across the surface of a giant,
clouds are seen of surface of planets (giants) and can look like disease.
The giant might then wish that his skin was a bit more pliant.
The planet may be better off with less clouds?
mood
My mother is the sea and sky, my father's of the earth,
Your mood is influenced by both the weather and the events that happen on earth
When those two come together, all but destined is my birth,
You have a mood
I grow so much larger than the substance I consume,
Your mood can change radically from a small incident
To one of the avengers, my existence could spell doom,
Hulk change with his mood, doom can be used to spell mood
I could spread like pox across the surface of a giant,
Even giants are sensitive to mood changes
The giant might then wish that his skin was a bit more pliant.
He wish to have a toughter skin
the answer to the above question is:
RUST.
sciencetag obligatory ? $\endgroup$