The Archean rocks of the shields are primarily of two types: A- Igneous and sedimentary B- Gneiss terrains and greenstone belts C- Basalt and granite D- Sandstone and shale
Question
The Archean rocks of the shields are primarily of two types: A- Igneous and sedimentary B- Gneiss terrains and greenstone belts C- Basalt and granite D- Sandstone and shale
Solution
The correct answer is B- Gneiss terrains and greenstone belts. The Archean rocks of the shields are primarily of these two types. Gneiss terrains are high-grade metamorphic rocks that have experienced high temperatures and pressures, while greenstone belts are typically formed of volcanic and sedimentary rocks.
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