"Cordilleras" <span>are parallel sets of mountain ranges within the Andes Mountains. A cordillera is a chain of mountain ranges - and it is an extensive chain. The term itself originates from Spanish that has the same meaning. It is applied to different ranges that includes the Andes of South America but seldom on other mountain ranges in the ridge.</span>
<u>Stromatolites are layered mounds of calcium carbonate that were deposited by algae during the Precambrian time.</u>
Answer: Option C
<u>Explanation:</u>
Stromatolites are the deposit of the layer which is mostly of limestone and these are mainly formed by the blue green algae which are only one celled organism of primitive times.
The features of these are that they are normally thin and have layers that might be either light or dark in color and are either flat or some of them even have a shape of a dome.
The awnser is a because it is the best awnser
