(19. define civil twilight, nautical twilight and astronomical twilight. which twilight allows outdoor activities to persist without using artificial lighting? !

Pre-dusk, early to medium twilight phases allow outdoor activities without using artificial lighting

Explanation:

Civil twilight is a term, and we describe it as "the time after sunset and before sunrise ends or begins when the sun seems to be about 6 degrees underneath the horizon during which the light for normal outdoor occupations is adequate on clear days.

Nautical twilight is the second stage of twilight. By this time, both horizon and the brighter stars are easily visible, making navigation around sea possible.

Astronomical twilight occurs whenever the Sun is under the horizon between 12° and 18°

Pre-dusk, early to medium twilight phases allow outdoor activities without using artificial lighting

Pre-dusk, early to medium twilight phases allow outdoor activities without using artificial lighting

Explanation:

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.