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Q: What is the topmost layer of the Earth's surface called ?
  • A. Mantle
  • B. Core
  • C. Magma
  • D. Crust
Correct Answer: Option D - The Earth has four different layers inside it. All layers have different physical properties. The four layers of Earth are Crust: It is the outermost solid part of the earth. It is brittle in nature. The thickness of the crust varies under the oceanic and continental areas. Oceanic crust is thinner as compared to the continental crust. The mean thickness of oceanic crust is 5 km whereas that of the continental is around 30 km. The continental crust is thicker in the areas of major mountain systems. It is as much as 70 km thick in the Himalayan region. Silica, Alumina, Lime, Iron Oxide and Magnesium are found in this layer. Mantle: The layer below the crust is Mantle. The mantle extends from Moho’s discontinuity to a depth of 2,900 km. Thickness of this layer is more than that of crust. Mostly silicate rocks, rich magnesium and iron are found in this layer. This layer is in molten state that is also known as magma. Outer core: The layer below the mantle is known as outer core. The temperature in this layer is about 5000C. Nickel is founded in this layer. Inner core: This is the central layer of Earth. It has a maximum temperature.
D. The Earth has four different layers inside it. All layers have different physical properties. The four layers of Earth are Crust: It is the outermost solid part of the earth. It is brittle in nature. The thickness of the crust varies under the oceanic and continental areas. Oceanic crust is thinner as compared to the continental crust. The mean thickness of oceanic crust is 5 km whereas that of the continental is around 30 km. The continental crust is thicker in the areas of major mountain systems. It is as much as 70 km thick in the Himalayan region. Silica, Alumina, Lime, Iron Oxide and Magnesium are found in this layer. Mantle: The layer below the crust is Mantle. The mantle extends from Moho’s discontinuity to a depth of 2,900 km. Thickness of this layer is more than that of crust. Mostly silicate rocks, rich magnesium and iron are found in this layer. This layer is in molten state that is also known as magma. Outer core: The layer below the mantle is known as outer core. The temperature in this layer is about 5000C. Nickel is founded in this layer. Inner core: This is the central layer of Earth. It has a maximum temperature.

Explanations:

The Earth has four different layers inside it. All layers have different physical properties. The four layers of Earth are Crust: It is the outermost solid part of the earth. It is brittle in nature. The thickness of the crust varies under the oceanic and continental areas. Oceanic crust is thinner as compared to the continental crust. The mean thickness of oceanic crust is 5 km whereas that of the continental is around 30 km. The continental crust is thicker in the areas of major mountain systems. It is as much as 70 km thick in the Himalayan region. Silica, Alumina, Lime, Iron Oxide and Magnesium are found in this layer. Mantle: The layer below the crust is Mantle. The mantle extends from Moho’s discontinuity to a depth of 2,900 km. Thickness of this layer is more than that of crust. Mostly silicate rocks, rich magnesium and iron are found in this layer. This layer is in molten state that is also known as magma. Outer core: The layer below the mantle is known as outer core. The temperature in this layer is about 5000C. Nickel is founded in this layer. Inner core: This is the central layer of Earth. It has a maximum temperature.