Test: The Earth's Layers - Delhi Police Constable MCQ

The troposphere is a layer of the Earth's atmosphere, not a part of the Earth's interior.

The Earth's crust is primarily made up of silicate rocks and metal oxides.

The outer core, consisting of molten iron and nickel, is responsible for generating the Earth's magnetic field through the geodynamo process.

The mantle is the thickest layer of the Earth, located between the crust and the outer core.

The Moho is the boundary that separates the Earth's crust from the underlying mantle.

P-waves are the fastest seismic waves and can travel through both solids and liquids.

The outer core is in a semi-fluid state due to its high temperature and pressure, containing molten iron and nickel.

The Gutenberg Discontinuity separates the outer liquid core from the inner solid core.

The Earth's inner core has a radius of about 1,200 km, making its thickness approximately 200 km.

The mantle exhibits plasticity, which means it can flow over geological timescales, leading to the movement of tectonic plates.

Convection is the process by which heat is transferred within the Earth's mantle through the movement of molten material.

The primary source of information about the Earth's interior layers comes from studying the behavior of seismic waves produced by earthquakes.

The temperature at the center of the Earth's inner core is estimated to be around 5,000°C.

The theory of Plate Tectonics explains the movement of the Earth's lithospheric plates and their interaction at plate boundaries.

Mountain ranges are typically formed at convergent plate boundaries, where two plates collide.

Subduction is the process of one tectonic plate being forced beneath another and occurs at convergent boundaries.

Alfred Wegener proposed the theory of Continental Drift, which later contributed to the development of the theory of Plate Tectonics.

Seafloor spreading occurs at divergent plate boundaries, where new oceanic crust is formed as plates move away from each other.

The Himalayan mountain range was formed due to the collision of the Indo-Australian Plate and the Eurasian Plate.

Correct option is B. Mid-Atlantic Ridge