Small fragments of orbiting bodies that have landed on the surface of earth are known as

a. meteorites.
b. uranium.
c. zirconium.
d. asteroids.

Small fragments of orbiting bodies that have landed on Earth are known as meteorites.  If the fragments are still orbiting earth are known as meteoroids.  They are not called meteorites until they enter Earth's atmosphere.  Once a meteor enters Earth's atmosphere it will begin to burn up.  It may burn up completely or lose most of its size by the time is lands on Earth's surface.

They must use the scientific method