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Reading Comprehension Worksheets
Earth Science
Not Your Average Rock

Earth Science
Earth Science

Not Your Average Rock
Reading Level
     edHelper's suggested reading level:   grades 9 to 10
     Flesch-Kincaid grade level:   9.61

Vocabulary
     challenging words:    biotites, Non-minerals, nonsilicate, pyroxenes, rock-forming, sulfate, biotite, feldspar, ferromagnesian, halite, silicate, crystalline, muscovite, calcite, dolomite, inorganic

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Not Your Average Rock
By Trista L. Pollard 		  
1     Imagine it is a beautiful summer day. You have been lying around observing the clouds as they sail effortlessly float along. You decide to get up and explore your backyard for hidden treasure. As you are wandering through the freshly cut lawn, you notice a beautiful rock. While examining your rock, you vaguely remember a conversation your science teacher had about rocks and minerals. Could this be a mineral? Have you found the precious gem that will finance your college years and beyond? Well, before you get too excited, let's explore the characteristics of minerals.
 
2     Minerals are substances found in nature. They are classified as inorganic solids. Minerals have a specific chemical composition, an orderly internal structure, and a characteristic set of physical properties. There are four basic questions that scientists ask to determine if substances are minerals. The first question focuses on the mineral as an inorganic substance. Humans, plants, animals, and other single-celled organisms are classified as organic. Organic materials are living or were once living. Minerals are only made of non-living substances. The second question is whether minerals occur naturally. To be a true mineral, it must be made in nature. Man-made substances cannot be minerals. The third question focuses on the structure of the mineral. Minerals are crystalline solids. They have a specific internal crystal structure. Non-minerals do not have this structure. The last question scientists ask is if the substance has a consistent chemical composition. Minerals are usually made up of one to two substances. Rocks are usually made from a variety of substances melted together. If your rock meets all of these conditions, then it is definitely a mineral.
 
3     There are different types of minerals that exist on our planet. In fact, scientists have found over 3,000 minerals. There are only twenty of these minerals that are common. Common minerals are called rock-forming minerals. Rock-forming minerals are part of the rocks that make up our planet's crust. Ten out of the twenty common minerals on our planet make up 90% of the mass of the Earth's crust. So what are these ten important minerals? They are calcite, biotite, dolomite, halite, gypsum, orthoclase, quartz, ferromagnesian minerals, plagioclase, and muscovite.

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