Geologic Time/Rock Strata

Front

Based on the law of superposition, where would the oldest rocks be found?

Back

at the bottom

Front

What is an unconformity?

Back

A missing time or gap in the rock record because of erosion.

Front

Which technique can be used to determine the exact age of a rock?

Back

Radioactive dating

Front

What are fossils?

Back

preserved remains or traces of once living things

Front

Which letter matches with the OLDEST layer of rock? Options: W, X, Y, Z

Back

Y

Front

The time that it takes 50% of an element to decay is called what?

Back

the half-life

Front

What kind of rock would you typically find fossils in?

Back

sedimentary

Front

Index fossils are used by geologists to

Back

match rocks of the same age in different regions

Front

What kind of dating is used to compare the age of a rock to those around it?

Back

Relative

Front

The earth is ______________of years old

Back

Billions