ISP 203B exam 1 Questions With Solutions
How can we date rocks? Absolute dating: when did something happen? (only related to
chemical changes)
Relative dating: what happened first, what happened next (rock deformations)
Law of Faunal Succession life changes with time
need to use index fossils...
How can we date rocks? Absolute dating: when did something happen? (only related to
chemical changes)
Relative dating: what happened first, what happened next (rock deformations)
Law of Faunal Succession life changes with time
need to use index fossils or assemblages: wide range in space and short duration in time
Cross-cutting relationships a fault or intrusion is younger than the rock it cuts across.
How did the theory of plate tectonics evolve? Alfred Wegener's evidence included similar
rocks of the same geologic age along the edges of continents that had once been joined together,
as well as looked at the distribution of certain fossil plants and animals, which makes more sense
if the continents were joined together at the time these animals were living.
Oldest rocks on earth > 4 billion years old
Seafloor age no more than 180 million years: youngest at the ridges
, ISP 203B exam 1 Questions With Solutions
Theory of plate tectonics: 1967 Princeton group (Morgan) and Scripps group (McKenzie
& Parker) independently developed mathematical models to define the plate motions
3 types of plate boundaries divergent (plates spread apart)
convergent (plates move toward each other)
transform (plates slide past each other)
Where does seafloor form/disappear? divergent: create new oceanic lithosphere (seafloor
spreading)
convergent- collision (if two continents), "recycle" old oceanic lithosphere, subduction
Subduction one plate going under another plate
How fast do plates move? centimeters per year
Major earth layers crust, mantle, outer core, inner core
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