Which of these survive Earths crust?
A. Inner layer consiting of two parts
B. Middle layer, density increases with depth
C. Top portion called asthenosphre, thickest layer
D. Thinnest under the oceans and thickest under continent's
I picked C but had thoughts about D ....
Describes* earth crust
From Wikipedia:
"The continental crust is thicker, and the oceanic crust is thinner. "
To determine which of these options survive Earth's crust, we need to understand the composition and structure of the Earth's layers.
The Earth's layers can be classified into three main parts: the core, the mantle, and the crust. The core is located at the center of the Earth and is composed mainly of iron and nickel. The mantle surrounds the core and consists of solid and semi-solid rock-like material. Finally, the crust is the outermost layer, which we are interested in.
Now let's analyze each option:
A. Inner layer consisting of two parts: This description refers to the core and the mantle, which are not considered part of the Earth's crust. Hence, this option does not survive Earth's crust.
B. Middle layer, density increases with depth: This description also refers to the mantle, not the crust. Therefore, this option does not survive Earth's crust either.
C. Top portion called asthenosphere, thickest layer: The asthenosphere is part of the Earth's upper mantle, which lies beneath the crust. Although it is relatively close to the crust, it is not part of the crust itself. So, option C does not survive Earth's crust.
D. Thinnest under the oceans and thickest under continents: This description refers to the Earth's crust. The crust can vary in thickness, and it is thinner beneath the oceans compared to the continents. Thus, option D does survive Earth's crust.
In conclusion, the correct answer is D, as the thinnest portion of the Earth's crust is found under the oceans, and it becomes thicker beneath the continents.