Internal Structure of the Earth - Free MCQ Practice Test with solutions,

Surface waves cause the most significant damage during an earthquake as they travel along the Earth's surface, resulting in strong shaking.

The correct answer is Earth's silicate mantle and its liquid iron-nickel outer core.
Key Points

• The Gutenberg discontinuity occurs within Earth's interior at a depth of about 2,900 km below the surface at the boundary between Earth's mantle and outer core.
•  The Moho lies at a depth of about 35 km below continents and about 7 km beneath the oceanic crust.
• Modern instruments have determined that the velocity of seismic waves increases rapidly at this boundary.
• The Moho was named for Andrija Mohorovicic.

The temperature of the Earth's inner core is estimated to be around 6000°C (10,800°F).

The Richter scale is a logarithmic scale used to measure the magnitude of earthquakes.

The primary source of energy that drives the movement of tectonic plates is geothermal energy from the Earth's interior.

The Earth's mantle occupies about 60% of its total volume, making it the largest layer by volume.

Seafloor spreading is the process of new oceanic crust forming at divergent boundaries.

Subduction is a process that occurs at convergent boundaries, not a type of boundary itself.

Igneous rock is formed from the cooling and solidification of lava or magma.

Subduction is the process where one tectonic plate is forced beneath another into the Earth's mantle.

The Ring of Fire is a region characterized by a high concentration of active volcanoes and frequent seismic activity, encircling the Pacific Ocean.

Divergent boundaries are formed when two tectonic plates move away from each other, creating new crust in the process.

The movement of tectonic plates is primarily caused by the flow of semi-molten rock in the mantle driven by convection currents.

The lithosphere is the rigid outermost layer of the Earth, composed of solid rocks and sediment.

S-waves cannot pass through the Earth's liquid outer core as it only allows P-waves to propagate.

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

The Earth's magnetic field is generated by the movement of molten iron in the outer core.

The innermost layer of the Earth, known as the inner core, is solid due to the immense pressure it experiences.

The Earth's core is predominantly made up of iron and nickel, contributing to its dense and solid nature.

The Earth's approximate radius is 6,371 km, which represents the distance from the center to its surface.