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1.Lava that cools so quickly that ions do not have time to arrange themselves into crystals will form igneous rocks with a _____ texture
* porphyritic
* glassy
* coarse-grained
* fine-grained
2.What type of composition does an igneous rock have that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals?
* granitic
* basaltic
* andesitic
* ultramafic
3.Why can two igneous rocks have the same minerals but different names?
* The rocks may have different colors.
* The rocks may be found in different areas.
* The rocks may be of different sizes.
* The rocks may have different textures.
* porphyritic
* glassy
* coarse-grained
* fine-grained
2.What type of composition does an igneous rock have that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals?
* granitic
* basaltic
* andesitic
* ultramafic
3.Why can two igneous rocks have the same minerals but different names?
* The rocks may have different colors.
* The rocks may be found in different areas.
* The rocks may be of different sizes.
* The rocks may have different textures.