The spectrum of galaxy a and galaxy b both contain the h-alpha emission line, which is normally seen at 653nm. however, in galaxy a the line has an observed wavelength of 710nm, whereas in galaxy b the wavelength is 685nm. which galaxy is farther away?

Which is a possible result of higher air temperatures caused by global warming? a. increase in sea level b. freezing of polar ice caps c. rapid evaporation of water in the soil d. flooding of low-lying coastal areas

Which layer surrounds the center of the earth? a: crust b: core c: mantle

To solve this system of equations by elimination, what operation could be used to eliminate the y-variable and find the value of x? 6x + 5y = 2 4x + 2y = 8 a) subtract 2 times the second equation from 3 times the first equation b) subtract 3 times the second equation from 2 times the first equation c) subtract 5 times the second equation from 2 times the first equation d) subtract 2 times the second equation from 5 times the first equation