Which of the following igneous rocks would contain the highest percentage of quartz (silica)?

As water is cooled from 4 c to 0 c its density

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted

Based on current rates the earths human population is expected to grow how much by 2050