Question

Where did Archean rocks form and what is their nature? A. Most Archean rocks occur in bluestone belts, consisting largely of metamorphosed, dark, volcanic rocks. B. Most Archean rocks occur in greenstone belts, consisting largely of felsic, granitic rocks. C. Most Archean rocks occur in greenstone belts, consisting largely of weathered, light, volcanic rocks. D. Most Archean rocks occur in greenstone belts, consisting largely of metamorphosed, dark, volcanic rocks.

Answer 1

Answer and Explanation:

Archean rocks are also known as Pre-Cambrian rocks. Archean rocks are the oldest rocks of the earth's crust. The Archean period is very significant because it covers 86.7% of the Total geological history time of earth. This period is the development of first photosynthesis; this period is also the life support atmosphere.

The Archean atmosphere has nearly lacked free oxygen. Astronomers think that the Sun had about 70–75 percent of the present luminosity.

Most Archean rocks occur in greenstone belts. Rocks of these Archean belts consist mainly of metamorphosed dark volcanic rocks and sedimentary rocks. These rocks formed from sedimentary rocks. Along with banded rocks, iron formations in deep waters alongside small continents.