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Scoria is a volcanic igneous rock that is composed of approximately 50% silica and 10% calcium oxide and lesser contents of potash and soda. Its hardness on the Mohs scale is 5 - 6.

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Is limestone coarse grained or fine grained?

Limestone can be both coarse-grained and fine-grained, depending on its composition and how it formed. Coarse-grained limestone typically contains larger mineral grains visible to the naked eye, while fine-grained limestone has smaller mineral grains that are not easily seen without magnification.


Which would weather faster a fine grained or a coarse grained igneous rock?

A fine-grained igneous rock would likely weather faster than a coarse-grained igneous rock. This is because the smaller grains in a fine-grained rock provide more surface area for weathering processes to act upon, leading to quicker breakdown and erosion.


What igneous rocks form on or very near Earth's surface?

Some common igneous rocks that form on or very near Earth's surface are basalt and scoria. Basalt is a fine-grained rock that often originates from volcanic eruptions, while scoria is a more vesicular or bubble-rich rock that forms from rapidly cooling lava on the surface.


A coarse-grained rock and a fine-grained rock probably had different .?

Cooling rates. A coarse-grained rock likely cooled slowly, allowing larger crystals to form, while a fine-grained rock probably cooled quickly, resulting in smaller crystals.


What is the orgin of fine grained igneous rock?

Fine-grained igneous rocks are formed when magma cools quickly at or near the Earth's surface, resulting in rapid crystal formation. This rapid cooling prevents large mineral crystals from forming, giving the rock its fine-grained texture. Examples of fine-grained igneous rocks include basalt and rhyolite.