To which fuel do chemical companies add a chemical odorant to in order to detect leaks?

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

What layer of the atmosphere is directly above the troposphere?

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.