What is a fossil?
remains (left over) of an organism
Define geological time
time that has passed since the earth formed
True or False: Fossils can be a plant or animal
true
According to the principle of superposition, the youngest rocks are on the...
top
According to the principle of superposition, the oldest rocks are on the...
bottom
What is relative dating?
Comparing 2 rocks to find out which one is older
The principle of cross cutting says younger rocks do what to older rocks?
cut
Scientist use what to know the specific age of a fossil
absolute dating
Name an example of radioactive elements
decay, breaking
What is an era?
specific time period, dates
True or False: Precambrian era is the oldest and longest era
True
What developed during the Paleozoic era? sea life or land life
sea life
What developed during the Mesozoic era? sea life or land life
land life
What went extinct during the Mesozoic era?
Dinosaurs
This era had a lot of glaciers- precambrian or cenozoic
cenozoic
Name all 4 of the geological time eras
precambrian, paleozoic, mesozoic, cenozoic
