Question

why are meteorides such different sizes

Answer 1

Answer:

Most meteoroids that cause meteors are about the size of a grain of sand, i.e. they are usually millimeter-sized or smaller. Meteoroid sizes can be calculated from their mass and density which, in turn, can be estimated from the observed meteor trajectory in the upper atmosphere.

Explanation:

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Answer 2

There are three main types of meteorites: iron meteorites: which are almost completely made of metal. stony-iron meteorites: which have nearly equal amounts of metal and silicate crystals. stony meteorites: which mostly have silicate minerals.Meteoroids are significantly smaller than asteroids, and range in size from small grains to one-meter-wide objects. Objects smaller than this are classified as micrometeoroids or space dust. ... This phenomenon is called a meteor or "shooting star".