Rock Types
These are the three types of rocks.
What are igneous, sedimentary, and metamorphic rocks?
The measure of whether a mineral will scratch or be scratch is known as this.
What is hardness?
The preserved remains of something that was once living.
What is a fossil?
Clastic Sedimentary rocks are formed from these particles, which are formed through weathering processes.
What are sediments?
Determining the age of an object by comparing the number of parent isotopes and number of daughter isotopes
What is Absolute Dating?
This is the change of mineral composition and texture of a rock due to heat and pressure.
What is metamorphism?
This is a reference for mineral hardness.
What is Moh’s Hardness Scale?
This is the process of determining the order of past events compared to other events.
What is Relative Dating?
This process wears rocks down into smaller pieces.
What is weathering?
This is the period of time it takes for 50% of a radioactive element to decay
What is half-life?
This type of igneous rock has small crystals
Extrusive Igneous
This is how much matter is in a certain amount of space.
What is density?
Virginia has fossils from these three Geologic Eras
What are the Paleozoic, Mesozoic, and Cenozoic Eras?
This is the transport of sediments from one place to another.
What is erosion?
A substance has a half-life of 5 years. This is the amount of years that have passed after the substance has gone through 3 half-lives?
What is 15 years?
Flat layers in metamorphic rocks are known as this.
What is foliation or banding?
This is a tendency of a mineral to break along certain planes to make smooth surfaces.
What is cleavage?
This states that younger rocks always lie above older rocks.
What is the Law of Superposition?
This law states that a fault or intrusion that cuts across a horizontal layer is younger than the rocks it cuts through
What is the Law of Cross-Cutting?
523 radioactive atoms undergo two half-life cycles. This is the percentage of radioactive atoms remaining
What is 25%?
This is the ongoing relationship between the formation and transformation of rock types.
What is the rock cycle?
The mineral CaCO₃ belongs in this mineral group, determined by chemical composition.
What are Carbonates?
This type of fossil are widespread geographically but limited to a brief period of time, which makes them useful indicators for paleontologists?
What are index fossils?
Deposition, the settlement of moving sediments at a new location, is caused by this force.
This type of radiometric dating is used to find the age of things like bones, wood, and shells.
Radiocarbon dating