Atomic mass number of first 30 elements

Why are people not able to skip a dive to the deepest part of the ocean

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.