Answer:
The Precambrian, Paleozoic, Mesozoic, and Cenozoic Eras
Explanation:
To increase the flow of the Nile in order for Egypt to realise its ambitious desert reclamation plan, Egypt sees the completion of the digging of the Jonglei canal through the vast swamps of the Sudd in Southern Sudan as the top priority.
Both Radioactive dating of rocks retrieved from the world and Comparing cratering rates on one world to those on another.
Geologists can find the relative age of impact craters on a world because
the ones on top must be younger.
Scientists know the history of Earth's magnetic field because the magnetic field gets frozen into rocks, and plate tectonics spreads them out.
Hope it helps
7=(-4)x+6. Hope this helps
