List three things that an astronomer can learn about a star by studying its spectrum.

Do larger countries receive more money in remittances than smaller countries

List 3 factors commonly used to select the location of a city

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.