Geology Flashcards
(20 cards)
Describe two kinds of evidence from ancient climate zones that wegener used to support his theory
- glacial evidence in now warm places
- coal found in now cold places
How do patterns is fossil locations and landform data give evidence of Pangaea
- same fossils found on different continents
- mountain ranges could match up with other mountain ranges on different continents
What are the three types of plate boundaries
Transform, divergent, convergent
when 2 of earth tectonic plates spread, what land feature is formed
rift valley
when 2 of earths tectonic plates collide, what land feature is formed
Mountains or trenches
what kind of tectonic plates collide boundary do we live near
Transform
where did scientists find new evidence that continental drift is happening
Mid ocean ridges
which plate subducts when a continental and oceanic plate collide
oceanic
What are two pieces of evidence the scientist used to confirm the theory of tectonic planes?
- matching magnetic stripes on ocean floors
- discover of sea floor spreading
what did sonar tell scientist about the ocean sea floor
told about the trenches and mid ocean ridges
What unusual geological features do all of the mid ocean ridges have in common
volcanic activity, rift valleys, and symmetrical magnetic patterns
What new theory explained Weiner’s continental drift
plate tectonics theory
new sea floor is constantly be added on either side of what
Mid ocean ridges
describe the different processes that occur at mid ocean ridges in deep ocean trenches
Create new crust and allowed old crust to be abducted
What causes conduction currents in earths interior and how does it relate to plate motion?
Convection currents in mantle, move plates by circulating heat and causing density changes
where is the oldest rock in the ocean floor to be found? the youngest?
Oldest- trench
Young - mid ocean Ridge
What are the two sources of energy that power the rock cycle?
-The sun (weathering and erosion); sedimentary
-Earth’s internal heat (metamorphic, and melting) ; igneous and metamorphic
What is the process of forming sedimentary rocks?
Weathering and pressure
what is the process of forming igneous rocks?
Cools from magma
What is the process of forming metamorphic rocks?
Heat and pressure changes
