Misc: What vegetable offers the highest source of calcium?

Questions

in may 1948, mt ruapehu and mt ngauruhoe, both in---------- , erupted simultaneously?

in space you cannot cry because there is no ---------- to make the tears flow?

in the---------- , time is often measured by how long it takes to smoke a cigarette?

in the andes, ---------- is often measured by how long it takes to smoke a cigarette?

in the arctic, the ---------- sometimes appears to be square?