What is Wave motion
las ondas fisica
movimiento ondulatorio

Ineed with these last two questions: 1) what are two types of cold air masses that influence the weather in north america? name them and describe their humidity. 2) describe the motion of a cold air mass and a warm air mass and the weather you would expect at a warm front and an occluded front.

Often called simply "velocity," this is the velocity of an object at a particular moment in time.

What was the first instrument to ever record an earthquake?