Fossils
These remains or traces of living things are found in rocks.
Fossils
This method tells the exact age of a rock.
Absolute dating
These large pieces of Earth’s crust move slowly.
tectonic plates
This underwater mountain range is where new ocean crust forms.
ocean ridge
A scientist who studies rocks and Earth’s history
a geologist
Finding the same fossil on different continents is evidence that continents were once connected.
continental drift
This method tells which rock is older or younger.
relative dating
This theory explains how continents move over time
plate tectonics
This is the deepest part of the ocean
ocean trench
This scientist studies fossils
paleontologist
Fossils are usually found in this type of rock
sedimentary rock
This timeline shows Earth’s history from oldest to youngest.
geologic time scale
Tectonic plates move about as fast as this grows
fingernails
This process creates new seafloor at ocean ridges.
seafloor spreading
This scientist studies earthquakes and seismic waves.
What is a seismologist
This fossil shows the activity of an organism, like footprints.
trace fossil
In rock layers, the oldest layers are usually found here
the bottom
When plates collide, mountains can form at this boundary
convergent boundary
The Mid-Atlantic Ridge is an example of this feature.
ocean ridge
Geologists use rock layers and fossils to study this
Earth's past
Fossils help scientists learn about Earth’s past life and this.
Earth's history or the history of Earth
Earth is about this many years old.
4.6 billion
When plates move apart, new crust forms at this boundary.
divergent boundary
The Mariana Trench is deeper than this famous mountain is tall.
Mount Everest
This type of evidence helped scientists prove continents once fit together
What is fossil, rock, and landform evidence