2 Original horizontality Superposition Cross-cutting relationships 1. You can tell that the oldest rocks are at the bottom of an undisturbed rock sequence by using the principle ofUniformitarianismOriginal horizontalitySuperpositionCross-cutting relationships
3 Original horizontality Superposition Cross-cutting relationships 2. The principle that states that the processes occurring today have occurred since the Earth was formed is known asUniformitarianismOriginal horizontalitySuperpositionCross-cutting relationships
4 3. In an undisturbed rock sequence, the youngest rock layer is located At the bottom of the sequenceAt the top of the sequenceBelow the sedimentary rock layerBelow the unconformity
5 4. The relative age of a rock layer that contains inclusions is Older than the source of the inclusionsOlder than the layer below itYounger than the source of the inclusionsThe same as the intrusion that cuts across it.
6 Fossils unconformities sills inclusions 5. What are particles eroded from a layer of rock that become incorporated in an overlaying rock layerFossilsunconformitiessillsinclusions
7 6.The Precambrian is the _________ part of the geologic time scale. youngestoldestc. shortestmost recent
8 7.The first organisms that lived on the earth were DinosaurBirdsMicroscopic organismworms
9 8.What two gases probably dominated Precambrian Earth’s atmosphere? HydrogenHeliumOxygenBoth Hydrogen and helium
10 9. Analyzing fossil chemistry can teach us about The environment in which the original organism livedHow the fossil movedThe precise age of the original organism when it diedThe social structure
11 Warm tropical temperatures Phytoplankton and zooplankton 10. Which of the following causes ocean water to be denser than fresh water?El Nin’oWarm tropical temperaturesPhytoplankton and zooplanktonDissolved substances
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