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One kind of volcanic glass that has holes caused by pockets of gas?

Pumice is a type of volcanic glass that contains holes caused by pockets of gas trapped during its formation. These holes give pumice a lightweight and porous texture, making it commonly used in beauty products and as an abrasive.


What Kind of rock is this glassy surface of lots of small holes in the rocks?

The glassy surface with lots of small holes in the rocks is typically associated with volcanic rock called pumice. Pumice forms when volcanic lava cools rapidly and traps gas bubbles, creating a lightweight, porous material. Its glassy texture and numerous holes give it a distinctive appearance, making it useful in various applications, including as an abrasive in beauty products and in landscaping.


What kind of metals are present in a doorknob?

This depends on the kind of doorknob: which material? wood, plastic, Bakelite


What kind of material do the connecting wires in a circuit have to be made of?

The outside of the wire needs to be made of an insulator since people touch it. The inside of the wire is made of conductors, such as copper, to it actually conducts electricity. Good luck with the paper!!


How can you tell if a 3 prong outlet is grounded?

=== === Tie the bare ground onto the ground screw in the back of the box then tie green wire from outlet to bare ground with a "wire nut", also known as a "marrette", or with an equivalent kind of secure electrical connector.=== === If you must go with a 3 prong outlet, ground the box. I would recommend a 4 prong outlet as it meets modern code and is safer.As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.Before you do any work yourself,on electrical circuits, equipment or appliances,always use a test meter to ensure the circuit is, in fact, de-energized.IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.