Question

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Answer 1

Explanation:

Continental crust

The continental crust is not uniform in nature because it is composed of rocks of different origins and is heterogeneous in the horizontal direction. It is necessary to make out the area of geological activity where tectonic activity and magmatic activity predominate, called orogenic . There are old and consolidated areas, which we call cratons. In these areas where most of its volume since the Mohorovičić discontinuity, is composed of acidic magmatic rocks and granites, although in the middle of this volume there is a sudden change between felsic and mafic rocks, we call this Conrad discontinuity. .

The minerals that we find the most are quartz, feldspar and mica, and the most abundant chemical elements are oxygen, silicon and aluminum, iron, calcium, sodium, potassium and magnesium.

The continental crust is generally much older than the oceanic crust . This occurs because in the subduction process it is destroyed very rarely. Some parts of the continental crust are estimated to be almost as old as the earth. Therefore, we could say I know that the current average age of the Earth's continental crust is about 2,000 million years.

Answer 2

1. Lithosphere (land).
2. Biosphere (living things).
3. Hydrosphere (water).
4. Atmosphere (air).