Geology Jeopardy 2

Igneous Rocks

100

This is the typical texture of melts that crystallize at the earth's surface.

What is fine-grained?

200

This rock makes up the ocean floor.

What is basalt?

300

The formula of this mineral is Mg₂SiO_4.

What is olivine?

400

Besides increasing temperature, this is one way to cause a rock to melt.

What is decreasing pressure?

500

This is the intrusive equivalent of rhyolite.

What is granite?

Volcanoes and Volcanic Hazards

100

This type of volcano has steep sides.

What is a stratovolcano/composite volcano?

200

The presence of this substance makes lava sticky.

What is water?

300

This feature forms when a volcanic dome collapses.

What is a cauldera?

400

This type of hazard exists when an active volcano is capped with ice.

What is a mudflow?

500

This chain of volcanos shows the changing direction of Pacific plate motion.

What is Hawaii?

Sedimentary Rocks

100

This is key factor in producing clast size, roundness, and sorting of particles in a sedimentary rock.

What is the transport distance?

200

This type of sedimentary rock consists of large rounded particles in a finer grained matrix.

What is a conglomerate?

300

This type of sedimentary rock can be distinguished from others because it is made up mostly of calcite.

What is limestone?

400

This type of sedimentary structure indicates that the rock was formed from the lithification of a sand dune.

What is cross-bedding?

500

The presence of these in sedimentary rocks allows a geologist to determine the age of the rocks.

What are fossils?

Deformation and Metamorphism

100

This feature forms when tress pulls a rock apart.

What are joints.

200

This type of fault forms in a tensional environment.

What is a normal fault?

300

This feature of metamorphic rocks forms when micas are aligned in parallel planes.

What is foliation?

400

This physical parameter causes a rock to be contact metamorphosed.

What is temperature?

500

The oldest rocks on earth are made up of this type of metamorphic rock.

What is gneiss?

Geologic Time

100

This is an erosion surface that represents a gap in geologic time.

What is an unconformity?

200

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?

300

This process allows geochronologists to attach a number to a layer of rock.

What is radioactive decay?

400

The appearance of this feature marks the beginning of the Paleozoic era.

What are shells/skeletons?

500

These are the most useful type of fossils for pinpointing the age of a rock layer that contains them.

What are index fossils?