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1. Crust, mantle, outer core, inner core

2. Mantle

3. Earthquakes are caused by shifts in the outer layers of Earth—a region called the lithosphere. The solid crust and top, stiff layer of the mantle make up a region called the lithosphere.

4. A seismograph is an instrument that measures and records details of earthquakes, such as force and duration.

5. Tectonic, volcanic, explosion and collapse

6. A volcanic earthquake is caused by the movement of magma beneath the surface of the Earth.

7. A tectonic earthquake occurs when strains in rock masses have accumulated to a point where the resulting stresses exceed the strength of the rocks, and sudden fracturing results.

8. Magnitude is a measure of earthquake size and remains unchanged with distance from the earthquake. Intensity, however, describes the degree of shaking caused by an earthquake at a given place and decreases with distance from the earthquake epicentre.

9. Earthquakes occur along fault lines, cracks in Earth's crust where tectonic plates meet. They occur where plates are subducting, spreading, slipping, or colliding. As the plates grind together, they get stuck and pressure builds up. Finally, the pressure between the plates is so great that they break loose.

10. You can describe the strenght of an earthquake by magnitudes and intensity.

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