Igneous Rocks
This is the typical texture of melts that crystallize at the earth's surface.
What is fine-grained?
This type of volcano has steep sides.
What is a stratovolcano/composite volcano?
This is key factor in producing clast size, roundness, and sorting of particles in a sedimentary rock.
What is the transport distance?
This feature forms when tress pulls a rock apart.
What are joints.
What is an unconformity?
This rock makes up the ocean floor.
What is basalt?
The presence of this substance makes lava sticky.
What is water?
This type of sedimentary rock consists of large rounded particles in a finer grained matrix.
What is a conglomerate?
This type of fault forms in a tensional environment.
If sedimentary rock layers are not tilted before they are overlapped by younger layers, but the boundary between them still represents millions of years of time, this feature develops.
What is a disconformity?
The formula of this mineral is Mg2SiO4.
What is olivine?
This feature forms when a volcanic dome collapses.
What is a cauldera?
This type of sedimentary rock can be distinguished from others because it is made up mostly of calcite.
What is limestone?
This feature of metamorphic rocks forms when micas are aligned in parallel planes.
What is foliation?
This process allows geochronologists to attach a number to a layer of rock.
What is radioactive decay?
What is decreasing pressure?
This type of hazard exists when an active volcano is capped with ice.
What is a mudflow?
This type of sedimentary structure indicates that the rock was formed from the lithification of a sand dune.
What is cross-bedding?
This physical parameter causes a rock to be contact metamorphosed.
What is temperature?
The appearance of this feature marks the beginning of the Paleozoic era.
What are shells/skeletons?
What is granite?
This chain of volcanos shows the changing direction of Pacific plate motion.
What is Hawaii?
The presence of these in sedimentary rocks allows a geologist to determine the age of the rocks.
What are fossils?
The oldest rocks on earth are made up of this type of metamorphic rock.
What is gneiss?
These are the most useful type of fossils for pinpointing the age of a rock layer that contains them.
What are index fossils?