Question

Толщина земной коры под ложем океанов равна ____ километров,под равнинами суши-____километров,под горными массивами суши-____километров.________________ земная кора имеет три слоя: ____ , ____ и ____ .В то время как ______________ земная кора имеет только два слоя: __________ и __________ .

Answer 1

Толщина земной коры под ложем океанов равна 5-10 км, под равнинами суши 30-40 км, под горными массивами суши - до 70 км. Земная кора имеет три слоя: осадочный, гранит и базальт. В то время как океаническая земная кора два слоя: осадочный и базальт.

Answer 2

Thickness of Earth's Crust:

The thickness of the Earth's crust varies depending on the location. Here are the approximate thicknesses of the Earth's crust in different areas:

- Under the ocean basins: 5-10 kilometers [[1]]. - Under the continental plains: 20-40 kilometers [[2]]. - Under the mountain ranges: 70-80 kilometers [[3]].

Layers of Earth's Crust:

The Earth's crust is composed of three main layers:

1. Continental crust: This is the thicker part of the Earth's crust that underlies the continents. It is primarily composed of granitic rocks and has an average thickness of about 35 kilometers [[4]]. 2. Oceanic crust: This is the thinner part of the Earth's crust that underlies the ocean basins. It is primarily composed of basaltic rocks and has an average thickness of about 7 kilometers [[5]]. 3. Mohorovičić discontinuity (Moho): This is the boundary between the Earth's crust and the underlying mantle. It is named after the Croatian seismologist Andrija Mohorovičić, who discovered it. The Moho is characterized by a significant increase in seismic wave velocity, indicating a change in rock composition and density [[6]].

It's important to note that the Earth's crust is just a small fraction of the Earth's overall structure. Beneath the crust lies the mantle, followed by the outer core and the inner core.

Differences in Crust Layers:

The main difference between the continental and oceanic crust lies in their composition and thickness:

- The continental crust is thicker and primarily composed of granitic rocks, which are less dense than the basaltic rocks that make up the oceanic crust. - The oceanic crust is thinner and primarily composed of basaltic rocks, which are denser than granitic rocks.

This difference in composition and density is due to the different geological processes that occur in continental and oceanic regions.

I hope this information helps! Let me know if you have any further questions.