This not necessarily points out that The specific examples of a polished slab are figure A and D. At first I read it as those figures were examples of meteorites, in general.. You may add a sentence to say something like "Examples of a polished slides are shown in figures A and D.

Generally, a fact is a very elementary statement based on some measurement, such as water boiling at 212° F.

The language used in science can be confusing sometimes. People often use terms like fact, hypothesis, law, and theory to explain natural phenomena incorrectly.

duplicate "often"