Stage 4 sleep. Stage 3 also often emits delta waves.
Zinc
volcano is my answer
This is a radioactive isotope.
A large celestial body that is composed of gas and emits light is called a star.
A large celestial body that is composed of gas and emits light is called a star.
No, it's called "radioactive." "Retroactive" is something that's active in regards to the past.
The star Delta Scorpii, also known as Dschubba, is a blue-white star. It emits a white to blue light due to its high surface temperature, which is around 22,000 K.
A volcanic hole is called a 'chimney ' while it emits lave and a 'caldera' when it solidifies.
radiation
In a battery, or voltaic pile, the negative terminal or wire, called the anode, emits electrons in an electrical circuit. The other terminal, called the cathode, collects electrons in an electrical circuit.
The fish which emits light is called a bioluminescent fish. Examples include anglerfish, lanternfish, and flashlight fish.
I think it is called neon. Something like that but I'm not so sure sorry!