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All rocks are combinations of two or more minerals. A mineral is a solid substance found in nature. Granite, for example, is a combination of the minerals quartz, mica, and feldspar.
The combination of minerals affects the weight of the rocks.
RELATED ARTICLE: Clay Cookies!
[eyes to observe] what to observe
How can the different weights of ingredients in a clay cookie demonstrate different weights of minerals in rocks?
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* modeling clay
Source: HighBeam Research, What's in a Rock?(Brief Article)