Q. Consider the following statements: 1.The mantle makes up more than 80% of the Earth’s volume.
2.Inner core is responsible for generating Earth’s magnetic field.
3.Oceanic crust is hotter than continental crust.
4.The reaction between seawater and mantle rocks on or near the seafloor releases hydrogen.
Which of the statements given above are correct?
Explanation –
Statements 1 and 4 are correct. The mantle, which lies between the Earth’s crust and core, accounts for about 84% of Earth’s volume. The reaction between seawater and mantle rocks on or near the seafloor releases hydrogen, which in turn forms compounds such as methane, which underpin microbial life.
Statements 2 and 3 are incorrect. The Earth’s magnetic field is generated by the outer core. The outer core consists of molten iron and nickel, and its convection currents create the magnetic field. The oceanic crust is generally denser but not hotter than the continental crust. It is generally understood that the oceanic crust is not necessarily hotter than the continental crust. Instead, the oceanic crust is denser and thinner compared to the continental crust.
Source: DD News
