called mandrel.
A hole in a tree trunk is often referred to as a "cavity." These cavities can be natural or created from damage or decay within the tree. They provide habitat for animals such as birds, squirrels, and insects.
The appendix is often referred to as the blind tube, as it is a small, hollow organ located at the end of the large intestine. It has no known significant function in humans and can sometimes become inflamed, leading to a condition called appendicitis.
The cell is the functional basic unit of life, and it is the smallest unit of life classified as a living thing. Really hope this helps! :)
A person who studies a lot is often called a "bookworm" or a "knowledge enthusiast."
Someone who types is often referred to as a typist.
Hollow spheres in limestone rock are called vugs. Vugs are formed when a cavity in the rock is later filled with minerals or crystals. They can vary in size and shape and are often sought after by collectors for their unique beauty.
It means the various parts of the item are joined with rivets made of brass or bronze. Often brass or bronze rivets are a decorative item.
A poetic valley can be called a dale, glen, hollow, or dell. These terms are often used in poetry to evoke a sense of natural beauty or melancholy.
Rivets come in various sizes, typically ranging from about 1/8 inch (3 mm) to 1 inch (25 mm) in diameter, and can be several inches long depending on the application. The size of a rivet is often determined by the thickness of the materials being joined and the specific requirements of the project. Commonly used in construction and manufacturing, rivets can also vary in shape and type, such as solid, blind, or tubular rivets.
A group of hard drives assembled into a RAID array is often referred to as, well, a "RAID array" a "RAID stack" or a "RAID cluster."
A hollow glacier is called a "glacier cave" or "ice cave". These formations are created when glacial meltwater carves out tunnels and chambers within the ice of the glacier. Glacier caves can vary in size and shape, and often exhibit spectacular ice formations.
Stones with crystals inside are called geodes. Geodes are natural rock formations that contain hollow cavities lined with crystals, often quartz or amethyst. They are often cut or broken open to reveal the beautiful crystals inside.
We often find a saw used to cut bolts. Rivets might be cut if we can get the saw on the body, but we often have to drill them out. A sidewinder grinder will make short work of them if you can get it on the body of the fastener. Certainly a plasma cutter will slice through them, but we have to be careful about damaging material around the fasteners when we cut them that way.
The hollow structure at the base of the pistil that protects developing ovules is called the ovary. It serves as a protective chamber for the ovules, where fertilization occurs and seeds develop. After fertilization, the ovary often matures into a fruit, aiding in seed dispersal.
That's a geode.
For decorative purposes, ornamental or decorative rivets are best suited. These rivets often have unique shapes, finishes, or designs that add aesthetic appeal to a project. Common types include dome-headed, flat-headed, or patterned rivets, which can enhance the visual interest of leather goods, furniture, or metalwork. Their decorative qualities make them ideal for applications where appearance is as important as functionality.
That's a geode.