Geology Review

1. Through using relative and radiometric dating techniques, geologists use rock samples and ________ to sequence life and major events and in Earth's history.
5. This type of geological feature is formed when two plates, both containing continental crust, meet head-on (two words).
7. This word, which describes the deepest part of our ocean, is formed at an oceanic-oceanic convergent boundary.
9. Obsidian has a glassy like surface, which is typical for this type of rock that is formed from the cooling of magma.
13. After billion years of mostly bacteria during the Precambrian Era, vertebrates appeared here on Earth 542 million years ago, only leaving ___% of Earth's history until the present (round to nearest whole number).
15. Crystals and ribbon-like layers, which can be found in rocks such as marble and gneiss, are found in this rock category-formed through intense pressure and heat.
16. Earthquakes and ___________ are highly concentrated in specific zones on Earth's surface.
17. While p-waves reach the seismograph first, _________ earthquake waves reach a seismograph last and cause the most damage.

2. This area is where one plate dives under another (two words).
3. After the infamous dinosaur mass extinction event in the Mesozoic Era, the Cenozoic Era kicked off the age of ___________.
4. This number is assigned to characterize an earthquake's strength.
6. The greater the difference between an earthquake's first p-wave and first s-wave, the further a seismograph is from the earthquake's _____________.
8. This type of plate boundary is where crust is destroyed, as two plates meet head-on.
10. If you are to find fossils, it is most likely to be in this type of rock.
11. At this plate boundary, new crust is created as two plates move away from each other, allowing magma to rise to the surface.
12. This type of plate boundary, also known as a fault, is where two plates are slowly sliding past each other.
13. To accurately find where an earthquake occurred, you need at least _______ seismograph stations.
14. If one minute passed between receiving an earthquake's first p-wave and s-wave, then the epicenter is _______-hundred km away (Refer to the graph in the "Earthquake hunting" assignment and spell out the number).
18. This type of valley is created at a boundary where two plates are moving away from each other. In Iceland's case, the Atlantic Ocean will eventually fill it.