How do astronomers recognize regions in the night sky? * A. by using constellations
B. by measuring apparent brightness
C. by using the Doppler shift of galaxies
D. by using naked-eye astronomy methods

Which evidence is most likely used to indicate the beginning of solar system formation? a. materials combined to form a mass. b. materials were pulled together by gravity. c. water condensed and collected to form oceans. d. different species of microorganisms lived on earth.

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

Name the peninsula that separates the bering sea from the sea of okhotsk?