Fill in the blanks to complete each statement about continental drift.

Continental drift was first proposed by a scientist named Alfred
. He theorized that the
were once one large landmass that drifted apart very slowly over a long time.

Amachine, modeled as a simple spring-mass system, oscillates in simple harmonic motion. its acceleration is measured to have an amplitude of 5,000 mm/s with a fre- quency of 10 hz. compute the maximum displacement the machine undergoes during this oscillation.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?