7. Change in velocity over time (1 Point)
O Speed
O Velocity
O Acceleration
O Displacement

Acceleration is the change of velocity over time.

Explanation:

Speed is the change of distance/time

Velocity can't be change in velocity over time, since that is itself.

Displacement is the change from starting position.

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.