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How long does it take a Styrofoam cup to decompose?

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It will take 400 years.
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How long does it take cardboard to decompose?

Cardboard, unless it is coated with a wax finish, is  bio-degradable. It will decompose in approximately 2-months.  Moisture, heat, and the presence of other biological mate

How long does it take foam - styrofoam - polystyrene to decompose?

Exposure to UV from sunlight will degrade the styrene molecule.  Exposure to ambient ozone will also degrade the styrene molecule.  In the sun, in a place with lots of ozone

What is in styrofoam cups?

Styrofoam cups are made of expanded polystyrene beads. The unexpanded beads (about the size of sand grains) are put in a mold then exposed to steam which expands them to grain

What is a styrofoam cup?

a cup made out of styrofoam....................................................................................................................................................