Cometa

Comets have a solid core composed of rock, dust, ice, and frozen gases like carbon dioxide, carbon monoxide, and ammonia. They are believed to originate in the cold, dark regions of the solar system. Comets become visible when their orbits bring them closer to the sun, causing the frozen gases to evaporate.

What materials make up the solid core of a comet?

• Rock, dust, ice, and frozen gases

• Metal, water, and oxygen

• Sand, clay, and liquid water

• Iron, nickel, and hydrogen

Which of the following gases is NOT found in the solid core of a comet?

• Oxygen

• Carbon monoxide

• Carbon dioxide

• Ammonia

Where are comets believed to originate?

• In the asteroid belt

• In the cold, dark regions of the solar system

• On the surface of planets

• Near the sun

What causes comets to become visible from Earth?

• They enter Earth's atmosphere

• They collide with asteroids

• They are illuminated by moonlight

• Their elliptical orbits bring them closer to the sun

What happens to the frozen gases in a comet as it approaches the sun?

• They remain unchanged

• They evaporate

• They turn into liquid

• They solidify further