List 5 different ice ages that have occurred through earth's history, and when they occurred?

1,700 to 2,300 mya  the middle of the Huronian Era in Precambrian time670 mya the end of the Proterozoic Era, in Precambrian time420 mya  the middle of the Paleozoic Era, between the Ordovician and Silurian Periods290 mya the late Carboniferous and early Permian Periods, late in the Paleozoic Era1.7 mya  the Pleistocene Epoch of the Quaternary Period (Cenozoic Era*mya-Million years ago

D, the answer is letter d. because even though fossil fuels take a very long time to form, they do form in the ground just like coal and others.