The physical characteristic that is used to distinguish intrusive igneous rocks from extrusive igneous rocks is ______________.
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[Ques. 2] The saying The present is the key to the past is a simple way to state the basic geologic concept of ______________.
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[Ques. 3] The scientist ______________ is generally regarded as the father of geology..
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[Ques. 4] A general name for an intrusive igneous rock formation is ______________.
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[Ques. 5] Rocks solidified from molten material below ground are classified as ______________ igneous rocks.
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[Ques. 6] Rocks solidified from molten material above ground are classified as ______________ igneous rocks.
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[Ques. 7] Rocks solidified from molten material, either below or above ground, are classified as ______________ rocks.
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[Ques. 8] Molten rock material on Earth's surface is known as ______________.
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[Ques. 9] Underground molten rock material is known as ______________.
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[Ques. 10] Silicates are minerals that have the oxygen and silicon ______________ as their basic structure.
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