eps final Flashcards
cross-cutting
igneous rock is younger than the rock it has intruded or cut or cross. faults too.
superposition
in a sequence of undisturbed rocks, the oldest rocks will be at the bottom.
absolute time
identifies the actual date of an event. if can tell the speed at which events are happening.
included fragments
little rocks in a big rock are actually older
unconformity
a break in the rock record. it shows where a part of the rock record is missing due to weathering and erosion.
key bed
a bed layer of rock that is distinguishable by the events that occurred over large horizontal distances»> mt. helen.
index fossil and 3 indentifications
used to date rock layers to a narrow range of time
- abundant
- easy to identify
- widely distributed
lateral continuity
sedimentary layers extend laterally in a thinning edge.
relative time
puts events into sequence but does not date actual time of occurrence.
principle of uniformitarianism
james hutton
-the forces and processes that we currently see shaping our planet also operated in the past.
original horizonaity
sediment accumulates in horizontal layers. if the rocks are folded etc. we can infer what happened after it formed.
positive feedback v negative feedback
positive= warmer temps etc.
negative=cooling temps etc.
endo v exothermic
endo= cooling/absorbing energy exo= heating/releasing energy
conduction
the transfer of energy through matter from particle to particle
-conducting like a conducter :)
convection
the transfer of heat energy in a gas or liquid by movement currents
-changes in temp causes changes in density
