Which is most likely a covalent compound?

a : lif
b : mgs
c : nh3
d : cacl2

1) sections 1, 2, and 10 are significant primarily because they suggest the likelihood that a) widow wycherly is actually the woman in the full-length portrait. b) dr. heidegger wants to include his guests in an experiment with the water. c) dr. heidegger plans to drink some of the water from the vase and needs witnesses. d) the guests will be asked to witness dr. heidegger's transformation when he drinks the water.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

Which wave would cause destructive interference at every point of the wavelength and completely cancel out the wave?