Final answer:
Stony meteorites and common rocks of Earth's crust can be difficult to distinguish due to their similar appearance and weathering effects, often requiring laboratory analysis to confirm their extraterrestrial origin.
Explanation:
Stony meteorites and common rocks of Earth's crust can be challenging to differentiate due to their similar appearance and the effects of weathering. Laboratory analysis is often needed to confirm if a sample is of extraterrestrial origin, especially if it has been exposed to weathering over time. For example, primitive and differentiated meteorites are more scientifically significant classifications than just stones or irons, as they offer insights into the parent bodies' compositions and histories.
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