fossils
what are fossils and how are fossils created?
fossils are evidence that something once existed. they are created when a plant or animal dies and is buried in the ground
what is petrification?
preserves the shape of the body material
why are geological time scales different from what we use today
geological time scales marked a significant event. We mark time through days, seconds, minutes, and the rotation of the sun
what is a boundary
where two plates meet
formed from magma and have large mineral crystals inside.
igneous rock
what are some different types of fossils?
trace fossil- a fossil of what the organism left behind such as a print
A body fossil- is of the actual organism
no longer exists
extinct
what is the structure of the earth
inner core, outer core, mantel, crust
what boundary is this; Divergent
two plates move away from eachother
composed of rounded grains and fragments cemented together. Many contain fossils
sedimentary rock
what is preservation potential?
the likelihood something is of being preserved
when a dense plate goes below a less denser plate
subduction
huge pieces of the earth's surface which are constantly moving
tectonic plates
what boundary is this; convergent
two plates move together
rock formed from intense heat and pressure inside the earth's surface
metamorphic rock
what are the things preservation potential depends on
Rapid Burial-buried very quickly and has a less chance of decaying
Gentle Burial- preserves better because the organism is not harmed
Burrowing- when an animal buries itself in the ground. less chance of being eaten
Little exposure to oxygen- less chance of decaying
More bones + teeth- don't break down
this can lead to the loss of fossil evidence
erosion or subduction
what is a convection current?
inner core heats up rock which causes hem to rise. then they cool and sink back down
what boundary is this; transform
moves side to side
what is the rock cycle
the cycle of which rocks are formed. from igneous to sedimentary to metamorphic. It can go in any direction and there is no order
what is amber?
tree sap that hardens and incases organism in it
mass extinction
where 90% of earthquakes and 77% of volcanoes happen
ring of fire
what is the main reason why earthquakes occur
tectonic plate activity
Bonus: volcanoes can cause earthquakes because of pressure
a warning that an earthquake is coming
shake alert