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100
What is the geologic age that is represented in years?
What is absolute age?
100
Fossils usually occur in what type of rocks?
What are sedimentary rocks?
100
What are the three types of rocks?
What are: sedimentary, metamorphic, and igneous
100
What is the record of life forms and geologic events in Earth's history?
What is the geologic time scale.
100
The present day is part of what era?
What is the Cenozoic Era?
200
The age of a rock compared to the ages of other rocks is?
What is relative age?
200
The process in which running water, wind, and ice loosen and carry away rock fragments.
What is erosion?
200
High pressure and temperatures can turn igneous rock into?
What is metamorphic rock?
200
Geologic time begins with a long span of time called?
What is Precambrian Time
200
Small solid pieces of material that come from rocks or living things is called?
What is sediment?
300
Which law states that, in horizontal layers of sedimentary rock, the layers of rock on top are younger than the layers of rock below them.
What is the Law of Superposition?
300
Rocks that form from the cooling of magma below the surface or lava at the surface are called?
What are igneous rocks?
300
The process by which sediment settles out of wind or water.
What is deposition?
300
The Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called?
What are eras?
300
Igneous rocks that form beneath the Earth's surface.
What are intrusive rocks?
400
What type of dating enables geologists to determine the absolute age of rocks?
What is radioactive dating?
400
Igneous rock that formed from lava that erupted onto the Earth's surface is called?
What are extrusive rocks?
400
Dissolved minerals and particles of sediment stick together to form sedimentary rock in a process called?
What is cementation?
400
The end of the Paleozoic was marked by what?
What is Permian extinction?
400
The time it takes for one half of the atoms in a sample of a radioactive element to decay is called?
What is half-life?
500
The fossils of organisms that were widely distributed, but only lived during a short period of time are called?
What are index fossils?
500
What are the four steps in sedimentary rock formation?
What is: Weathering OR: Erosion Transportation Deposition Deposition Compaction Lithification Cementation
500
Name at least four steps of the rock cycle?
What is: Erosion Deposition Heat and Pressure Melting Volcanic activity
500
Each era is known as the "Age of ......" Name the three eras and what they are known as.
What is Cenozoic - Age of Mammals Mesozoic - Age of Reptiles Paleozoic - Age of Fishes (Marine life)
500
A gap in the geologic record where some rock layers have been lost because of erosion is called?
What is an unconformity?