Geological Features and Intrusions

Dr. Christopher White discusses igneous rocks, focusing on magma chambers and intrusions. The video covers environments where magma accumulates, such as oceanic hotspots and divergent plate boundaries. It explains types of intrusions like irregular plutons, stocks, sheet-like plutons, and baffleths, highlighting their formation and characteristics.

What is a common environment where large volumes of magma are generated?

• Desert regions

• Oceanic hot spots

• Mountain peaks

• Polar ice caps

Which geological feature is associated with magma generation at continent-continent collision zones?

• Ocean trenches

• Mountain ranges

• Coral reefs

• Volcanic islands

What is the characteristic shape of an irregular pluton?

• Spherical

• Cylindrical

• Triangular

• Flat

What is a stock in geological terms?

• A small, steeply dipping pluton

• A volcanic crater

• A type of metamorphic rock

• A type of sedimentary rock

How do sheet-like plutons typically form?

• By rising vertically through the crust

• By spreading laterally due to similar density with the crust

• By sinking into the mantle

• By evaporating into the atmosphere

What is a sill in geological terms?

• A vertical intrusion

• A small, horizontal intrusion

• A large, vertical intrusion

• A volcanic vent

What distinguishes a lopolith from a sill?

• Its vertical orientation

• Its sedimentary composition

• Its large size

• Its volcanic origin

What is a baffleth?

• A sedimentary basin

• A type of volcanic eruption

• A series of multiple intrusions

• A single large intrusion

Which type of rock is commonly found in baffleths?

• Limestone

• Sandstone

• Basalt

• Granite

What is the Sierra Nevada baffleth primarily composed of?

• Sandstone

• Limestone

• Granite

• Basalt