Earth's Structure and Dynamics - Geology & Branches

Vocabulary flashcards covering branches of geology, Earth layers, differentiation, continental drift, plate tectonics, boundaries, and associated geosciences.

Geology

The branch of science that deals with the study of the Earth as a whole, including its origin, age, interior structure, history, and processes.

Physical Geology

The branch of geology that studies Earth's materials, features, and processes such as weathering, erosion, volcanism, and plate movement.

Mineralogy

The study of minerals, including their chemical composition, internal structure, and physical properties.

Petrology

The branch of geology that studies rocks, particularly their origin, composition, texture, and physical characteristics.

Structural Geology

The study of geological structures and rock deformation, including faults, folds, joints, and fractures.

Historical Geology

The study of rock layers, rock history, and the sequence of geological events across geological time.

Paleontology

The scientific study of fossils and prehistoric life preserved in rock strata.

Economic Geology

The branch of geology focused on locating and extracting valuable Earth materials such as ores, minerals, sand, and gravel.

Engineering Geology

The application of geological science to engineering practice to ensure geological factors are addressed in construction projects.

Mining Geology

The field dealing with the exploration, discovery, and extraction of underground minerals, ores, and fossil fuels.

Geohydrology

The study of groundwater movement, pressure, and physical properties within soil and rock layers.

Geophysics

The application of physical principles—such as seismic waves, gravity, and magnetism—to study the subsurface of the Earth.

Geochemistry

The study of the chemical composition of Earth materials and the chemical processes operating within the Earth.

Site Investigation

The process of evaluating soil, rock, and subsurface geological conditions at a site before construction using mapping, boreholes, and testing.

Bearing Capacity

The capacity of soil or rock to support loads applied by foundations without undergoing shear failure or excessive settlement.

Settlement

The downward movement of the ground surface or foundation caused by structural loading.

Shear Strength

The capacity of soil or rock to resist sliding or internal displacement along internal planes.

Crust

Earth's thin, solid outermost layer consisting of rocks and minerals where human structures are built.

Oceanic Crust

The thinner, denser, primarily basaltic layer of Earth's crust underlying ocean basins.

Continental Crust

The thicker, less dense layer of Earth's crust commonly composed of granite-type rocks.

Mantle

The thick layer of hot silicate rocks beneath the crust that exhibits semi-fluid or ductile behavior.

Outer Core

The liquid layer of Earth composed primarily of iron and nickel whose fluid motion generates the planet's magnetic field.

Inner Core

The solid central core of Earth made of iron and nickel, maintained in a solid state due to extreme pressure.

Differentiation

The process by which Earth separated into distinct compositional layers as denser materials sank to the center and lighter materials rose.

Continental Drift

The theory proposed by Alfred Wegener that continents were once joined and gradually drifted across Earth's surface over time.

Pangaea

The ancient supercontinent that incorporated nearly all of Earth's landmasses before breaking apart approximately 200 million years ago.

Plate Tectonics

The comprehensive theory stating that Earth's lithosphere is divided into rigid plates that move across the underlying asthenosphere.

Lithosphere

The rigid, solid outer layer of Earth comprising the crust and the uppermost portion of the mantle.

Asthenosphere

The softer, weaker, semi-fluid layer of the mantle directly below the lithosphere upon which tectonic plates float and move.

Mantle Convection

The thermal circulation pattern in the mantle where hot material rises and cool material sinks, acting as a key driver of plate motion.

Slab Pull

The tectonic driving force exerted when a cold, dense oceanic plate subducts into the mantle and pulls the attached plate behind it.

Ridge Push

The tectonic driving force occurring at elevated mid-ocean ridges where gravity forces newly created lithosphere outward and downward.

Divergent Boundary

A boundary where two tectonic plates move away from each other, allowing magma to rise and form new crust.

Convergent Boundary

A boundary where two tectonic plates collide or move toward each other, resulting in subduction or mountain formation.

Transform Boundary

A boundary where two tectonic plates slide past each other horizontally, frequently causing seismic activity.

Subduction

The geological process where one tectonic plate descends beneath an overriding plate into the mantle.

Seafloor Spreading

The process where upwelling magma creates new oceanic crust at mid-ocean ridges and pushes older crust away.

Paleomagnetism

The study and record of Earth's historic magnetic field orientation preserved in magnetic minerals within cooling igneous rocks.

Seismology

The branch of geophysics that studies earthquakes and the propagation of elastic seismic waves through Earth.

Volcanology

The study of volcanoes, lava, magma, and related geothermal phenomena.

Geomorphology

The study of topographic landforms and the physical processes that shape Earth's surface.

Stratigraphy

The branch of geology that studies layered sedimentary rocks (strata), their relationships, and geological ages.