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| from the Greek root "petro" meaning "rock" or "stone", literally "wood turned into stone") is a type of fossil. |
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Definition
| formed by the accumulation and consolidation of mineral and organic fragments that have been deposited by water, ice, or wind |
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Definition
| derived by solidification of magma or molten lava emplaced on or below the earth's surface |
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| Metamorphic rocks are formed when igneous, sedimentary, or other metamorphic rocks undergo a physical change due to extreme heat and pressure. |
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Definition
| A sedimentary rock formed by the consolidation and compaction of sand and held together by a natural cement, such as silica. |
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