Answer:
the u.s. navigation signal timing and rang, and (navstar) GPS
Radio telescopes have to be much larger than optical telescopes because the wavelengths of radio waves are so much larger<span> than the wavelengths of visible light.
just search it up on Google . . .</span>
I would say All Of The Above.
a) pillow lava
Pillow lava only forms underwater, and occurs when lava is squeezed out of a crevice and solidifies incredibly quickly.
5 arrive - 3 leave = 2 left every minute
80 in total - 30 already there = 50 need to arrive
50/2
= 25 minutes
hope this helps :)
