Week 16

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 of Uniformitarianism Original horizontality Superposition Cross-cutting relationships

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 as Uniformitarianism Original horizontality Superposition Cross-cutting relationships

3. In an undisturbed rock sequence, the youngest rock layer is located At the bottom of the sequence At the top of the sequence Below the sedimentary rock layer Below the unconformity

4. The relative age of a rock layer that contains inclusions is Older than the source of the inclusions Older than the layer below it Younger than the source of the inclusions The same as the intrusion that cuts across it.

Fossils unconformities sills inclusions 5. What are particles eroded from a layer of rock that become incorporated in an overlaying rock layer Fossils unconformities sills inclusions

6.The Precambrian is the _________ part of the geologic time scale. youngest oldest c. shortest most recent

7.The first organisms that lived on the earth were Dinosaur Birds Microscopic organism worms

8.What two gases probably dominated Precambrian Earth’s atmosphere? Hydrogen Helium Oxygen Both Hydrogen and helium

9. Analyzing fossil chemistry can teach us about The environment in which the original organism lived How the fossil moved The precise age of the original organism when it died The social structure

Warm tropical temperatures Phytoplankton and zooplankton 10. Which of the following causes ocean water to be denser than fresh water? El Nin’o Warm tropical temperatures Phytoplankton and zooplankton Dissolved substances