fossils
what are index fossils used for
to help date when other organisms would be alive
how is the law of superposition used
by dating rocks and fossils relatively by comparing them to other rocks and fossils
what is the longest period of time according to the geologic time scale
Precambrian
what is a sedimentary rock
a rock made from sediment partials in the water
why doesn't Pangaea still exist today
continental drift
what is a mold fossil
a fossil that has mud covering the organism so it makes a mold around it
how do faults impact rock layers and rock dating
they make it so the layers are off set making it harder to date the rocks
what period of time do we live in
cenezoic
what is an igneous rock
a rock made from cooled molten lava
explain how marine fossils can be on top of mountains
the climate changes over time
what is a trace fossil
an imprint of a organism usually their foot
how can you tell the relative age of rock layers
using the law of superposition
when did the dinosaurs live
Mesozoic
what are ice cores used for
to tell the climate at a certain time
how can you date rock layers with faults and unconformity
there has to be something before it can be taken away so the rocks always come first
what is a preserved fossil
a organism is trapped in ice or amber and still in tact
what is the difference in relative and absolute dating
relative gives a relative date absolute gives an exact time
which time period had the first larger organisms
Paleozoic
what is a large difference in igneous and sedentary rocks
igneous can't have fossils in it
how is an earthquake evidence for tectonic plates
it shows the plates moving and smashing toghether
what are the different types of fossils
mold cast petrified preserved carbonized trace
what is radioactive decay used for
to date fossils absolutly
what killed the dinosaurs
why don't igneous rocks have fossils
they are molten lava destroying the organisms
a filled in mold fossil