Gravity is what type of force?
field force
contact force
normal force
frictional force

Gravity is field force

Explanation:

because a gravitational field is a model used to explain the influence that a massive body extends into the space around itself, producing a force on another massive body. Thus, a gravitational field is used to explain gravitational phenomena, and is measured in newtons per kilogram

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:

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms