High pressure can change an igneous rock into a _________ rock.
The smaller particles of rock or the remains of living things that make up sedimentary rocks are called _________.
Fossils usually occur in _________ rock.
Footprints and trails are examples of _________ fossils.
The law of superposition helps geologists determine the _________ age of a rock layer.
At the beginning of the Paleozoic Era, a great number of different types of organisms evolved in an event called the _________.
Rock layers are always _________ than the faults that cut across them.
On the geologic time scale, the Mesozoic Era is divided into the Triassic, Jurassic, and Cretaceous _________.
The era before the Mesozoic Era is the _________.
Generally, only the _________ parts of organisms become fossils.
Remains of prehistoric dead organisms
What is a fossil?
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions above and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see this FAQ.