This bingo card has a free space and 29 words: the hardest known mineral; found in "pipes", small deposits of igneous and metamorphic crystals, any hollow space in the earth's crust that has formed naturally and is large enough for a person to enter, any rock containing a metal together with impurities, the rarest, most durable and beautiful gems, the most commonly used practical metal; used for thousands of years to make tools, a metal that is a good conductor of electricity; two of its alloys are brass and bronze, any trace of a plant or animal left in a rock, the area surrounding a magnet in which the force of the magnet affects other objects is called, the ends of a magnet are called, the magnetic field produced by the earth is called, the hardest material that composes the earth's crust is called, when molten rock solidifies, it forms _______ rock, sand and mineral fragments that have been pressed together form ________________ rock, rock that has been changed by extreme heat or pressure into a new kind of rock is known as _________ rock, over 75% of the earth's surface is covered with ______ rock, what type of igneous rock is formed at the earth's surface, cools rapidly, and has a fine-grained appearance, what is the most common igneous rock and can be found everywhere on the land, which sedimentary rock is formed by chemical sediments and is used for salting roads and flavoring food, which sedimentary rock is used to make glass, which sedimentary rock is the only stone formed by living animals, which metamorphic rock began as shale, is very hard, and has leaflike layers, which metamorphic rock is perhaps one of the most beautiful and most widely used, and began as limestone, what type of metamorphic rock is made up of layers like leaves of a book, a _______ is designed to live either in a cave or above a cave, speleology is the study of _______, caves usually form in _____, a ______ is formed by the dissolving of underground rocks by water and a _______ visits a cave regularly but must return to the surface for food.
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