In space, however, telescopes<span> are able to get a clearer shot of everything from exploding stars to other galaxies. Another </span>disadvantage<span> for ground-based</span>telescopes<span> is that the Earth's atmosphere absorbs much of the infrared and ultraviolet light that passes through it.</span>
Answer:
a. By Calculating magnetic reversals.
Explanation:
They determine the age of the ocean floor by examining magnetic fields in the planet Earth.
