Acomet is a

meteoroid that travels through earth’s atmosphere and hits the surface.
meteoroid that burns up in earth’s atmosphere, producing a streak of light.
small, rocky object that orbits the sun and is usually found in a belt between the orbits of mars and jupiter.
small object made of ice and dust that orbits the sun and forms a coma as it approaches the sun.

A comet is a small object made of ice and dust that orbits the Sun and forms a coma as it approaches the Sun.

A comet is a small celestial body consisting mainly of ice, dust and gas in a (usually very eccentric) orbit around the sun and forming a coma, and sometimes having a tail of matter (gas and dust particles) blown back from it by the solar wind as it approaches the sun.

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.

italy:

classic, nostalgic, romantic and beautiful. no place better than italy or sicily.