Reading the Rocks
Fossils are most commonly found in this type of rock
What is sedimentary rock?
This is the method scientists use to determine the absolute age of a fossil.
What is radiometric dating?
This planet has surface features that suggest it once had flowing water.
What is Mars?
Fossils in deeper rock layers are usually (older or younger?) than fossils found in upper layers.
What is older?
The Geologic Time Scale divides Earth’s history into these long periods.
What are eras?
The layers of rock on planets help scientists learn about their history, just like on Earth. What are these layers called?
What are strata?
The Law of Superposition states that in undisturbed rock layers, the oldest rocks are found where?
What is the bottom?
Scientists believe the dinosaurs became extinct due to this major event.
What is an asteroid impact?
Scientists compare Earth’s geologic history to other planets using this method.
What is comparative Planetology?