rock type
granite/limestone able to hold vertical slope. sands/clay only stable at low angles.
Rocks can be classified into three major types: igneous, sedimentary, and metamorphic.
1. Igneous rocks are formed from molten magma or lava, which solidifies and crystallizes over time. These rocks are typically hard and dense, and can have a glassy, crystalline, or fine-grained texture. Examples of igneous rocks include granite, basalt, and pumice.
2. Sedimentary rocks are formed from the accumulation of sediment, which can be eroded particles of other rock types, shells and fossils, or chemical precipitates. These rocks are often layered, with visible sedimentary structures such as bedding and fossils. Examples of sedimentary rocks include limestone, sandstone, and shale.
3. Metamorphic rocks are formed from the transformation of existing rocks due to heat, pressure, or chemical alterations. These rocks can have dramatic changes in texture, mineral composition, and overall appearance compared to their parent rocks. Examples of metamorphic rocks include marble, slate, and gneiss.
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