A vertical gap in limestone is called a grike. The remaining blocks of rock are called klints. The cracks in limestone are called joints.
Hollow spheres in a limestone rock could be called pockets or geodes.
Clay does not turn into limestone. Lithified clay is called shale.
A gap in an area's geologic history is called an unconformity.
The rock tripoli is considered a siliceous limestone, as most of the calcium carbonate has been weathered out or baked out by proximity to a plutonic intrusion.
A gap in the geological record in a body of rock is called an unconformity.
Limestone is formed in layers called Bedding Planes and the vertical cracks are called Joints. The horizontal cracks are not given a specific name - however I am sure someone will want to contradict this
Limestone is called limestone because it has lime in it from the sea water it if formed in.
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Recrystallized limestone is generally called marble. Recrystallized quartz sandstone is generally called quartzite. There is no such thing as quartz limestone.
If it is a horizontal crankshaft the gap is .030 if it is a vertical crankshaft it is .020
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Vertical poems are called acrostic poetry.
Hollow spheres in a limestone rock could be called pockets or geodes.
A vertical row of bricks is called a channel.
The soft greyish limestone that crumbles easily is called chalk.
Clay does not turn into limestone. Lithified clay is called shale.
The gap for the plug on all horizontal shafts is .030" and some vertical shafts are .020"