Text for questions number 64 - 66.

    Meteorites are among the rarest materials that exist on earth-far less common than gold, diamonds, or even emeralds. Therefore, the chances of discovering a new example are slim-even for those who make their living hunting for and studying meteorites.

    A specimen that is thought to be a meteorite, but turns out to be a common earth rock is affectionately and humorously dubbed a meteor-wrong. The surface of our planet is rich in terrestrial iron oxides such as magnetic and hematite (many of which will stick to a magnet), dark black rocks such as basalt, and many different types of man-made metallic by-products such as run off (slag) from old smelters and cast off iron implements. All of these materials are frequently mistaken for meteorites. Identification of a genuine meteorite takes a practiced eye, but there are a number of simple tests that can help hopeful rock hounds determine if they have stumbled across a rare space rock or just a common earthbound stone.

    Meteorites tend to look different from the ordinary terrestrial rocks around them. They do not contain the common earth mineral quartz, and in general, do not contain vesicles. When gas escapes from cooling molten material, it creates small pinprick holes in a rock's surface. The volcanic rock pumice, often used in skincare for the removal of calluses, contains vesicles, which is one of the reasons it is very light in weight. If a suspected meteorite looks like a sponge, with lots of tiny holes, it is probably volcanic rock or slag of earthly origin.

This passage would probably be assigned reading in which of the following course?