Which describes the molecular motion of a solid nickel marble rolled across the floor?
a. the constant vibration of the nickel atoms that make up the marble
b. the motion of the nickel atoms due to contact with the floor
c. the transfer of atoms from the top to the bottom of the marble in response to gravity
( i am pretty sure it is a)

Tsunamis are fast-moving waves often generated by underwater earthquakes. in the deep ocean their amplitude is barely noticeable, but upon reaching shore they can rise to an astonishing height of a six-story building. one tsunami generated off the aleutian islands in alaska, had a wavelength of 897km and traveled a distance of 3280km in 4.18h. (a) what was the speed (in m/s) of the wave? find the waves (b) frequency and (c) period.