francium is commonly found as hard rock unless it comes from gravestones
When the hard parts of an organism decay and leave a cavity in the rock, a fossil mold can form. This mold is a negative impression of the organism's hard parts in the surrounding rock, preserving the shape and structure of the original organism.
Molten rock (magma) that spews from a volcano is called lava, When it cools, the lava forms igneous rocks.
A very hard rock that is often formed inside limestone is marble. Marble is a metamorphic rock that forms when limestone is subjected to high pressure and temperature, resulting in a harder and more crystalline structure.
Clastic sedimentary rocks.
Coal comes in many forms and is hard like a rock.
coal
Coal
coal
Minerals can come in a variety of forms and are naturally occurring solids that have a characteristic crystalline structure. Minerals like quartz and diamond are examples of hard minerals that can be mistaken for rocks due to their physical properties.
Igneous Rock comes from molten rock.
rock
a metamorphic rock is formed when it is under great heat and pressure and after some time it forms magma. then the mama comes out through volcano and becomes hard , this rock that is formed is known as extrusive igneous rocks.
food
limestone
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A hard sedimentary rock that forms inside limestone is called chert. It is composed of microcrystalline quartz and often forms nodules or layers within limestone due to the replacement of calcium carbonate by silica-rich fluids.