Some of the oldest rocks ever found have been estimated to be about 3.5 billion years old. Is it likely that these rocks were present when Earth was first formed? A. No, this rock is probably just a sedimentary rock that was formed by much younger igneous rocks. B. No, rock material is constantly recycled on Earth as rock is melted into magma. C. No, it is likely that any rocks older than a few hundred years are meteorites from outer space. D. Yes, the oldest rocks on Earth were likely some of the rocks present when Earth was first formed.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)