Geology Exam # 3 Review

- Proposed by Alfred Wegener in 1915 - Continent has not always been in their present locations but have drifted and changed positions.

- Fit of all of the continents - Fossil evidence - Rock type and structure similarities - Paleoclamatic evidence- Ancient Climates - Glacier deposit - Coal deposit

Oceanic: Form at mid ocean ridges Continental: Buoyant

- Paleomagnetism - Measuring the length of a hot spot track - Measuring plate motion from space

Divergent: two plates that move apart Convergent: two plates that move together Transform fault boundaries: two plates gring past each other without destruction

- Located along the crest of ocean ridges - Oceanic ridges and seafloor spreading - Hot rock from mantle

- Also called subduction zones - Deep ocean trenches, partial melting, continental volcanic acres, island arcs

- Found on ocean floor - Fracture zones

Movement of plates: - Convective flow in mantle sinks the cooler denser materials - Convective flow transports heat away from the earth's interior

- Process of matching rocks of similar ages in different regions. - Process uses a key bed or index fossil. - Correlation reveals a more complete picture of the sedimentary rock record because no locale exhibits the entire sequence.

Long period or break in the rock record usually caused by non deposition or erosion.

Gap in rock record between the overlying layered rock and the underlying deformed rock sequence.

Gap in rock record between the overlying layered rock and underlying unlayered rock.

Gap in rock record between the two layers in the rock.

- Relative dating: placing rocks in proper sequence in formation.