Mesozoic Era: Age to the Reptiles; Triassic, Jurassic, and Cretaceous
Cenozoic Era: Age of Mammals; marine invertes, fish, amphibians, reptiles, birds, mammals
Order of time terms Answer: Eon, Era, Periods, Epochs
Absolute Dating Answer: using radioactive elements to find the age of the fossil
Uniformitatiansim Answer: physical, chemical, and biological laws are the same now as they were in
the past
Catastrophism Answer: the theory that changes in the earth's crust during geological history have
resulted chiefly from sudden violent and unusual events.
Lithosphere divisions Answer: Continental plates
, Oceanic Plates
Asthenosphere Answer: The soft layer of the mantle on which the lithosphere floats.
Mesosphere Answer: The strong, lower part of the mantle between the asthenosphere and the
outer core; 80% of earth's materials.
Rifting Answer: the process by which Earth's crust breaks apart; can occur within continental crust
or oceanic crust
Subduction Answer: The process by which oceanic crust sinks beneath a deep-ocean trench and
back into the mantle at a convergent plate boundary.
ocean surface currents Answer: Currents that move on or near the surface of the ocean and are
driven by winds and uneven heating of earth's atmosphere.
subsurface currents Answer: ocean currents that flow beneath the surface, also called deep ocean
currents; influenced by land masses and earth rotation
density current Answer: current of ocean water that results from density differences among water
masses
3 temperature zones in the ocean Answer: surface zone, thermocline, deep zone
Windbelts Answer: convections cells that circle the earth
warm front Answer: a front where warm air moves over cold air and brings drizzly rain and then are
followed by warm and clear weather
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