Answer:
Redbeds indicate the presence o iron in the environment. Red beds are red sedimentary rocks and the color is due to the presence of the ferric oxides. Ferric oxides occur as a coating on the sedimentary grains. In between the shale and cherts, iron-rich sediments can be found.
Explanation:
Takes about 10 billion years for a star with the mass of the sun to covert all the hydrogen in its core.
10 billion years.
