Earth Science

1. the part of a continent that is stable and forms the central mass of the continent; typically Precambrian era .
3. boundary In geology, subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic...
4. The upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection...
8. boundary In plate tectonics, a convergent boundary also known as a destructive plate boundary (because of subduction), is an actively deforming.
11. The crust and upper mantle of the earth.
15. boundary In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary).
16. A fracture in rock where there has been movement and displacement. One of the major boundaries between tectonic plates on earth.

1. crust The relatively thick part of the earth's crust that forms the large landmasses. It is generally older and more complex than the oceanic .
2. scale A numerical scale for expressing the magnitude of an earthquake on the basis of seismograph oscillations.
5. waves A type of seismic wave, the S-wave, secondary wave, or shear wave (sometimes called an elastic S-wave) is one of the two main types of .
6. waves are type of elastic wave, also called seismic waves, that can travel through gases (as sound waves), solids and liquids,.
7. A record produced by a seismograph.
9. Boundrys these boundaries are formed when two plates collide. When the two plate bump one plate is absorbed in the mantle of the other. Heat and pressure when these plates collide causes volcanoes and earthquakes.
10. crust The relatively thin part of the earth's crust that underlies the ocean basins.
12. Tectonics A theory that explains the global distribution of geological phenomena such as seismicity, volcanism, continental drift, and mountain building in terms of the formation, destruction, movement, and interaction of the earth's lithospheric plates.
13. A sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust .
14. the point on the Earth's surface directly above the focus of an earthquake .