Geologic Time

The Geologic Time Scale is a record of what?

• old geologists
• sweet geology music
• the known history of rocks and fossils
• a list of every living thing ever

The Law of Superposition helps scientists to determine what?

• The absolute age of rock layers
• The age of fossils
• The relative age of rock layers
• the super powers of rocks

A scientist who studies fossils is called a what?

• Fossilologist
• Rock Hound
• Archeologist
• Paleontologist

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

• at the bottom

• at the top

• second from the bottom

• second from the top

What is an unconformity?

• A layer of sedimentary rock

• A layer of rocks with unusual fossils

• An intrustion

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

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

• Radiometric dating

• Relative dating

What are fossils?

• the oldest layers of rock in a region

• living creatures with habitats in or around rocks

• preserved remains or traces of once living things

• objects that people of long ago left behind as artifacts

Which letter matches with the OLDEST layer of rock?

• W

• X

• Y

• Z

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

• the daughter product

• the half-wit

• the half-life

• the half-time

If the original mass of a radioactive element was 36 grams how much would be left after 1 half life?

• 36 grams

• 18 grams

• 9 grams

• 4.5 grams