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  1. Rock | Definition, Characteristics, Formation, Cycle, Classification ...

    Dec 29, 2025 · Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. Such aggregates constitute the basic unit of which the solid Earth is composed and …

  2. Igneous rock | Characteristics, Examples, Formation, & Types

    Dec 24, 2025 · Among the most fundamental properties of igneous rocks are crystallinity and granularity, two terms that closely reflect differences in magma composition and the …

  3. Uluru/Ayers Rock | Location, Map, & Facts | Britannica

    Dec 11, 2025 · The park is accessible by road from Yulara, and a road connects the Uluru/Ayers Rock area with the Olgas formations. Hiking around the base of the rock is a popular activity, …

  4. Sedimentary rock - Classification, Deposits, Types | Britannica

    Dec 17, 2025 · For the purposes of the present discussion, three major categories of sedimentary rocks are recognized: (1) terrigenous clastic sedimentary rocks, (2) carbonates (limestone and …

  5. Sedimentary rock - Deposition, Stratification, Weathering | Britannica

    Dec 17, 2025 · Sedimentary rock - Deposition, Stratification, Weathering: The sedimentary environment is the specific depositional setting of a particular sedimentary rock and is unique …

  6. Sedimentary rock | Definition, Formation, Examples,

    Dec 17, 2025 · Sedimentary rock, rock formed at or near Earth’s surface by the accumulation and lithification of sediment or by the precipitation from solution at normal surface temperatures.

  7. Metamorphic rock | Definition, Formation, & Facts | Britannica

    Dec 27, 2025 · Metamorphism can occur either when a rock moves from one position to another along a single geotherm or when the geotherm itself changes form. The former can take place …

  8. Metamorphic rock - Pressure, Temperature, Time | Britannica

    Dec 27, 2025 · The specific shape of a pressure-temperature-time (P-T-t) path depends on the tectonic setting in which the rock was metamorphosed, which in turn controls the relative rates …

  9. Tor | Rock Formations, Erosion, Landscapes | Britannica

    What is karst in geology? How do karst landscapes form? What kinds of rocks are commonly found in karst regions? What are some common features of karst landscapes?

  10. Igneous rock - Intrusive, Magma, Plutonic | Britannica

    Dec 24, 2025 · These coarse-grained intrusives account for about 4 to 5 kilometres of layer 3, which rests on a sequence of layered ultramafic rocks. The rocks were formed by the …