Sometimes, small pieces of rock or dust enter the Earth's atmosphere. When this material heats up and burns, it glows and becomes

visible from the Earth's surface.

These burning pieces of material are called

A. meteors

B. moons

C. comets

D.

planetoids

A. Meteors

Explanation:

Meteors are the small objects found in space. They are of various sizes. Their size ranges from small dust particle to small asteroids. When these meteors enter the earth's atmosphere, due to their high speed and the friction caused by gases in the atmosphere, their surface gets heats up and starts burning and they become visible as fireballs or shooting stars. They are found throughout the solar system and sometimes get caught in the gravitational attraction field of earth.

dynamic equilibrium is the answer.