Dynamic Earth

2. A longitudinal earthquake wave that travels through the interior of the earth and is usually the first conspicuous wave to be recorded by a seismograph.
5. A long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading.
7. A current in a fluid that results from convection.
9. A fluid layer about 2,300 km (1,400 mi) thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle.
11. lithosphere is a layer called the asthenosphere. This is made up rock that is fluid and can move.
14. A linear feature that exists between two tectonic plates that are moving away from each other.
15. The analysis of the relationships between different physical quantities by identifying their base quantities.

1. A tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates.
3. The final type of boundary is one where the two plates slide against each other in a sideways motion.
4. A geologic fault in which the hanging wall has moved downward relative to the footwall.
6. A type of map characterized by large-scale detail and quantitative representation of relief, usually using contour lines, but historically using a variety of methods.
8. Secondary waves, or shear waves are a type of elastic wave, and are one of the two main types of elastic body waves, so named because they move through the body of an object, unlike surface waves.
10. A geologic fault in which the hanging wall has moved upward relative to the footwall.
12. A record produced by a seismograph.
13. A fracture along which the blocks of crust on either side have moved relative to one another parallel to the fracture.