When a Comet Comes Close to the Sun, Its Volatile

question 41

Multiple Choice

When a comet comes close to the Sun, its volatile ice sublimates and transforms directly from the solid to ________ phase.

• A) liquid
• B) crystalline
• C) energized
• D) gas
• E) condensate

---

Definitions:

Breeder Reactor

A nuclear reactor designed to produce more fissile material than it consumes, typically using uranium-238 or thorium-232.

Coolant

A substance, typically a liquid or gas, used to reduce or regulate the temperature of a system or component.

Plutonium

A radioactive chemical element used as fuel in nuclear power plants and in the manufacture of nuclear weapons.

Nitrogen

A chemical element with symbol N and atomic number 7, making up 78% of the Earth's atmosphere by volume; it is a vital component of amino acids, proteins, and nucleic acids.