16.11: Earth's History- Challenge 2
- Page ID
- 5943
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- 1. Earth's earliest crust was made up of ___.
- basalt
- 2. The presence of ancient greenstones in cratons indicates the presence of ___.
- subduction zones
- 3. The continental collisions that create supercontinents also create mountain ranges through the process of ___.
- orogeny
- 4. The Paleozoic began with the supercontinent ___ and ended with the supercontinent ___.
- Rodinia; Pangaea
- 5. At the end of the Paleozoic, there existed ___ and ___.
- one supercontinent called Pangaea; one super-ocean called Panthalassa
- 6. Sea levels fall and land is gained from the sea during ___.
- marine regressions
- 7. A rise in sea level is a marine ___.
- transgression
- 8. Marine transgressions and regressions leave characteristic rock layers known as sedimentary ___.
- facies
- 9. The subduction of the oceanic Farallon plate beneath western North America during the late Jurassic and early Cretaceous produced ___ intrusions.
- igneous
- 10. The subduction of the Farallon plate created the ___ mountains.
- Sierra Nevada
- 11. If vigorous seafloor spreading can cause marine transgressions, slow seafloor spreading can cause ___.
- marine regressions
- 12. Africa collided with ___ to create the Alps.
- Eurasia
- 13. When Antarctica drifted over the South Pole region, ___.
- the continent began to grow an ice cap
- 14. The Quaternary and Holocene are part of the ___ era.
- Cenozoic