Author: Study Clue

The sloping plane of earthquakes in a subduction zone is called A Benioff zone B Rift zone C Fold axis

An earthquake focus at 450 km depth is classified as A Shallow-focus B Intermediate-focus C Surface-focus D Deep-focus Explanation Earthquakes

The depth of an earthquake’s focus is called A Wave length B Crust height C Focal depth D Ridge depth

Which instrument records earthquake waves? A Barometer B Thermometer C Seismograph D Hygrometer Explanation A seismograph records ground vibrations produced

The sharp drop in S-wave velocity just below the lithosphere is called the A Shadow zone B Moho jump C

The “S-wave shadow” beyond the core mainly indicates the core’s A Solid nature B Granitic rocks C Liquid portion D

When P-waves enter the liquid outer core, they mostly A Stop completely B Speed up sharply C Bend strongly D

Which layer is directly above the outer core? A Upper mantle B Lower mantle C Continental crust D Inner core

Which layer lies directly beneath Earth’s crust? A Upper mantle B Inner core C Outer core D Lower mantle Explanation

When Earth is at perihelion, the Southern Hemisphere summer is slightly affected because Earth’s orbital speed is A Lowest near