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geology exam #2

TermDefinition
crust solid, rich in quartz
upper mantle semi molten, richer in higher temp silicates
lower mantle mostly solid, richer in very high temp silicates
outer core liquid, Fe and Ni
inner core solid, Fe and Ni
earth has a self-sustaining _______ in its core geodynamo
geodynamo the mechanism responsible for the generation of the earth's magnetic field caused by convection and conduction of currents in fluid outer core
magnetic inclination the angle between earth's surface and the magnetic lines of force
what reproduce by simple cell division? prokaryotes
what reproduce by combining chromosomes from each parent? eukaryotes
ediacaran fauna marks the first appearance of large, architecturally complex organisms in earth history
organic evolution the changes in the genetic makeup of species in a population as a result of responding to environmental changes
adaptations special feature of plants and animals that perform one or more useful function
anatomical relationships embryos of many vertebrates are similar
homology presence in two different groups of animals or plants of organs that have the same ancestral origin but serve different functions
vestigial organs organs that serve no apparent purpose but resemble organs that perform functions in other creatures
population group of interbreeding individuals of same specie
specie a group of individuals that can be interbred
gene pool the sum total of all genetic components of a population or group of interbreeding individuals
reproductive barriers keep gene pools separate
speciation origin of new species from a preexisting one
transgression a landward shift of the coastline
regression a seaward shift of the coastline
scientific method a method of procedure or process that has characterized natural science since the 17th century
critical thinking desire to seek, patience to doubt, fondness to meditate, slowness to assert, readiness to consider, carefulness to dispose and set in order, and hatred for every kind of imposture
Created by: emilybobal
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