Adolescence /ˌæd

Particles are attracted to each other by gravitation.
gravitation /ˌgræv.ɪˈteɪ.ʃ ə n/ noun MOVEMENT TOWARDS
2. [ S or U ] when someone or something moves or is attracted in the direction of a particular thing or person
The gravitation of country people to/towards the capital began in the 1920s.
gravitational /ˌgræv.ɪˈteɪ.ʃ ə n. ə l/ adjective
relating to gravity or gravitation
gravitational forces
horizontal /ˌhɒr.ɪˈzɒn.t ə l/ /ˌhɔːr.ɪˈzɑːn.t ̬ ə l/ adjective
flat or level; parallel to the ground or to the bottom or top edge of something
Draw a horizontal line across the bottom of the page.
Keep the patient horizontal with the feet slightly raised.
Compare vertical
inevitable /ɪˈnev.ɪ.tə.bl ̩/ /-t ̬ə-/ adjective
1. certain to happen and unable to be avoided or prevented
The accident was the inevitable consequence/result/outcome of carelessness.
2. the inevitable
something that is certain to happen and cannot be prevented
Eventually the inevitable happened and he had a heart attack.
lunar /ˈluː.nə r / /-nɚ/ adjective
of or relating to the moon
the lunar surface